Japan PSE Certification Guide 2026: Diamond vs Round PSE Mark and METI Registration
Japan is the world's third-largest e-commerce market, with Amazon Japan (Amazon.co.jp) and Rakuten Ichiba generating over ¥25 trillion in combined annual sales. For cross-border sellers, Japan offers a uniquely attractive combination of high per-capita consumer spending, strong brand loyalty, and significantly less price competition than Western markets. However, Japan's electrical appliance safety regulations �?administered under the Electrical Appliance and Material Safety Law (DENAN Law) and enforced by the Ministry of Economy, Trade and Industry (METI) �?are among the world's most rigorously enforced. Every electrical product falling within regulated categories must display a valid PSE mark before entering Japanese commerce.
This guide provides a comprehensive walkthrough of the PSE certification system: understanding whether your product requires a Diamond or Round PSE mark, navigating the METI notification process, selecting the right Conformity Assessment Body, and ensuring compliance on Amazon Japan and Rakuten. Whether you are selling USB charging cables, smart home devices, kitchen appliances, LED lighting, or power banks, PSE compliance is non-negotiable.
Table of Contents
- Background: The DENAN Law and PSE System
- Diamond PSE vs Round PSE: Complete Comparison
- Product Category Lists: Which Products Need Which Mark
- JIS/J Standards and IEC Equivalents
- How to Select a METI-Registered CAB
- METI Registration: Step-by-Step Process
- Amazon Japan PSE Compliance Requirements
- Common PSE Rejection Reasons
- Testing Costs and Timeline Estimation
- Common Misconceptions About PSE
- Key Takeaways
- Frequently Asked Questions
Background: The DENAN Law and PSE System
The Electrical Appliance and Material Safety Law �?commonly called the DENAN Law (from the Japanese abbreviation 電安�? Den-an-hō) �?was enacted in 2001, replacing the older Electrical Appliance and Material Control Law. Its purpose is to prevent fires, electric shocks, and injuries caused by electrical appliances and materials. The law is administered by METI and enforced by Japan Customs at the border. The official English text and guidance are published on the METI PSE portal.
The DENAN Law divides electrical products into two tiers based on risk level:
- Specified Electrical Appliances and Materials (特定電気用品, Tokutei Denki Yōhin) �?Class A: These are 116 product categories considered higher risk, such as electric water heaters, AC adapters, electric pumps, and certain power supply units. They require the Diamond PSE mark and mandatory third-party conformity assessment by a METI-registered Conformity Assessment Body (CAB).
- Non-Specified Electrical Appliances and Materials (特定以外の電気用�? Tokutei Igai no Denki Yōhin) �?Class B: These are 341 product categories considered lower risk, such as USB cables, LED lamps, small household fans, and electronic toys. They require the Round PSE mark and allow the manufacturer or importer to self-declare conformity �?provided that the product has been tested against applicable Japanese J standards.
Critically, the DENAN Law also requires that the foreign manufacturer or the Japanese Importer of Record register with METI as the "Notifying Supplier" (届出事業�?. This registration must be completed within 30 days of the product first entering Japan, and a METI notification number must be displayed on the product or its packaging. Failure to register is a separate violation from failing to obtain the PSE mark itself.
Diamond PSE vs Round PSE: Complete Comparison
| Attribute | Diamond PSE (Class A) | Round PSE (Class B) |
|---|---|---|
| Japanese Name | 特定電気用品 (Tokutei Denki Yōhin) | 特定以外の電気用�?(Tokutei Igai no Denki Yōhin) |
| Product Categories | 116 categories | 341 categories |
| Risk Level | High �?potential for serious injury or fire | Moderate �?lower inherent risk |
| Conformity Assessment | Mandatory third-party testing and factory inspection by METI-registered CAB | Manufacturer self-declaration based on J standards test reports |
| Who Issues the Certificate | METI-registered CAB issues Certificate of Conformity | Manufacturer/importer issues self-declaration |
| Factory Inspection Required | Yes �?initial inspection + periodic surveillance (every 2�? years) | No factory inspection required |
| Mark Appearance | Diamond-shaped mark with "PSE" inside | Circle-shaped mark with "PSE" inside |
| Typical Timeline | 6�?2 weeks (including factory audit) | 3�? weeks (testing only) |
| METI Registration | Required for importer/manufacturer | Required for importer/manufacturer |
| Typical Cost (Testing + Certification) | $1,500�?5,000+ | $500�?1,500 |
Product Category Lists: Which Products Need Which Mark
METI publishes and updates the official lists of regulated products. Below are practical examples for the most common cross-border e-commerce categories:
| Product Category | PSE Type | Example Products |
|---|---|---|
| AC Adapters / Power Supplies | Diamond PSE | Laptop chargers, phone chargers (AC-DC), power adapters up to 1,500W |
| Electric Heating Appliances | Diamond PSE | Electric kettles, space heaters, electric blankets, hair dryers, curling irons |
| Electric Pumps | Diamond PSE | Submersible pumps, circulation pumps, air pumps (aquarium) |
| USB Cables / Data Cables | Round PSE | USB-A to Lightning, USB-C to USB-C cables, multi-port charging cables |
| LED Lighting | Round PSE | LED bulbs (E26/E17 base), LED strip lights, desk lamps with built-in LED |
| Small Household Fans | Round PSE | USB desk fans, portable handheld fans, clip-on fans |
| Power Strips / Extension Cords | Round PSE | Multi-outlet power strips, extension cords with Japanese plug (Type A, 100V) |
| Electronic Toys | Round PSE | Remote-controlled cars, electronic learning toys, robotic pets |
| Lithium-Ion Battery Packs | Round PSE (PSE mark) + JIS C 8712 | Power banks, portable chargers, replacement battery packs |
| Smart Home Devices | Round PSE | Smart plugs, Wi-Fi switches, smart light controllers (AC-powered) |
The full official METI list (including Japanese-language product names and exact scope definitions) is available at the METI PSE website. Always consult the official list — not a third-party summary — to determine classification, as minor product variations can shift a product from Class B to Class A (for example, a heating element in what otherwise appears to be a simple appliance).
PSE Compliance Checklist for Electronics
Don't let Japan Customs seize and destroy your shipments. Get the exact checklist we use to verify PSE compliance — covers Diamond vs Round classification, J standards testing, METI notification, and Japanese labeling requirements.
Download: PSE Compliance Checklist for ElectronicsJIS/J Standards and IEC Equivalents
Japan maintains its own set of electrical safety standards �?JIS (Japanese Industrial Standards) and the derivative J standards for DENAN Law compliance. Many J standards are harmonized with IEC, but important technical differences exist, and conformance to IEC alone does not fulfill J standard requirements.
| Product Type | Japanese J Standard | Closest IEC Equivalent | Key Differences |
|---|---|---|---|
| General Safety (Appliances) | J60335-1 (JIS C 9335-1) | IEC 60335-1 | Japan-specific 100V/50-60Hz requirements, plug/socket ratings, thermal cutoff specs per JIS |
| AC Adapters / Power Supplies | J60950-1 / J62368-1 | IEC 60950-1 / IEC 62368-1 | Input voltage 100V ±10%, specific insulation requirements, Japanese plug test |
| Lithium-Ion Batteries | JIS C 8712 / JIS C 8714 | IEC 62133-2 | Additional overcharge (JIS C 8712 Sec.9) and forced discharge tests, specific fire enclosure |
| LED Lamps | JIS C 8156 / JIS C 8157 | IEC 62560 / IEC 62031 | Japan-specific lamp base (E26/E17), rated input 100V, specific temperature rise limits |
| EMC Requirements | VCCI (for ITE) + DENAN EMC | CISPR 32 / CISPR 35 | VCCI is a separate voluntary/industry scheme; DENAN EMC requirements are embedded in J standards |
| Power Cords and Plugs | JIS C 8303 / JIS C 8306 | IEC 60320 / IEC 60884 | Japan-specific Type A plug (NEMA 1-15 equivalent, non-polarized, 125V/15A rating) |
How to Select a METI-Registered CAB
For Diamond PSE products, conformity assessment must be carried out by a Conformity Assessment Body (CAB) registered with METI. For Round PSE products, while self-declaration is permitted, using an accredited lab for testing is strongly recommended �?and Amazon Japan frequently requires test reports from recognized laboratories. Key considerations:
- METI Registration Status: CABs must be registered with METI under the DENAN Law. The official list of registered CABs is published on METI's website. Major international labs �?JQA (Japan Quality Assurance Organization), JET (Japan Electrical Safety & Environment Technology Laboratories), TÜV Rheinland Japan, UL Japan, and SGS Japan �?are all registered.
- MRA Partner CABs: Japan has Mutual Recognition Agreements (MRAs) with several countries, including the US, EU member states, and Singapore. MRA-designated CABs in these countries can perform Diamond PSE conformity assessment, eliminating the need to ship products to Japan for testing. Verify MRA status through METI's published lists.
- Scope of Accreditation: CABs are registered for specific product categories and specific J standards. A CAB registered for J60335-1 testing may not be registered for JIS C 8712 battery testing. Always confirm scope before engaging.
- Amazon Japan Recognition: While Amazon Japan does not publish an "approved lab list," test reports from JQA, JET, TÜV Rheinland, UL, SGS, Intertek, and Bureau Veritas consistently experience smooth document review. Reports from unfamiliar or niche labs may face additional scrutiny.
- Cost and Language: Japan-based CABs charge premium rates but provide reports and certificates in Japanese �?a significant advantage for METI registration documentation. MRA-partner CABs outside Japan are often more cost-effective but may only provide English-language reports, requiring certified Japanese translation for METI submission.
METI Registration: Step-by-Step Process
METI notification is a separate requirement from PSE mark certification. Every foreign manufacturer or Japanese importer dealing in PSE-regulated products must register as a "Notifying Supplier" within 30 days of the first product's importation. The process:
- Determine the responsible entity: If you are a foreign seller without a Japanese entity, your Japanese Importer of Record (IOR) �?often your freight forwarder, customs broker, or a designated legal representative in Japan �?must handle METI notification on your behalf. Some Amazon Japan sellers establish a local subsidiary or appoint an Authorized Representative specifically for this purpose.
- Prepare documentation: Required documents include: (a) the Notifying Supplier application form (obtainable from METI or your CAB), (b) the PSE test report or Certificate of Conformity, (c) product specifications (in Japanese), (d) the product marking/label design showing the PSE mark placement, and (e) company registration documents (with certified Japanese translation for foreign entities).
- Submit to the competent METI regional bureau: Applications are submitted to the METI Regional Bureau of Economy, Trade and Industry corresponding to the IOR's registered address in Japan. For foreign manufacturers, the application should go through the IOR's local METI office.
- Obtain the notification number: Upon acceptance, METI issues a notification number (届出番号). This number must be displayed on the product label alongside the PSE mark.
- Maintain compliance records: The Notifying Supplier is required to maintain test records, factory inspection reports (for Diamond PSE), and quality control documentation for a minimum of 3 years and make them available upon METI request.
Amazon Japan PSE Compliance Requirements
Amazon Japan's enforcement approach differs from Amazon US and EU. Key requirements:
- Category listing restrictions: Certain electrical categories �?including chargers, power banks, and heating appliances �?are restricted on Amazon Japan. Sellers must obtain pre-approval by submitting PSE documentation before being allowed to list in these categories.
- Document upload: Through Seller Central Japan, navigate to 在庫 �?在庫管理 (Inventory �?Manage Inventory), select the ASIN, and under the compliance section upload: (a) the PSE test report from a recognized lab, (b) the Diamond or Round PSE certificate (or self-declaration), and (c) the METI notification number.
- Product image requirements: Listing images must clearly show the PSE mark on the product or packaging. If the physical sample does not yet carry the mark (pre-production), the listing will remain suppressed until post-production images are uploaded.
- Labeling requirements in Japanese: All product labels �?including the PSE mark, METI notification number, voltage rating (定格電圧), power consumption (定格消費電力), and manufacturer name �?must be in Japanese. English-only labels are not compliant.
- Ongoing audits: Amazon Japan conducts periodic compliance document audits. Sellers may receive requests to re-upload or update PSE documentation even years after initial listing. Maintaining current documentation is essential.
Common PSE Rejection Reasons
- Incorrect classification (Diamond vs Round): The most frequent error is self-declaring Round PSE for a product that actually requires Diamond PSE certification. Review the METI product category list carefully �?AC adapters, heating appliances, and certain motor-driven devices are Diamond PSE regardless of power rating.
- Testing to wrong standard: Using IEC 60335-1 test reports when J60335-1 (JIS C 9335-1) is required. Some CABs outside Japan offer "IEC-based with Japan deviations" reports �?ensure these explicitly state compliance with the J standard.
- Voltage incompatibility: Products designed for 110�?40V universal input that have not been specifically tested at 100V ±10% (the Japanese nominal voltage). Japan's grid operates at 100V, not the 110/120V common in North America.
- Plug type mismatch: Products shipped with non-Japanese plugs (US Type B, EU Type C/F, UK Type G). Japan uses Type A plugs (two flat parallel pins, non-polarized) rated at 125V/15A.
- Missing Japanese labeling: The PSE mark, METI number, and mandatory electrical specifications must be in Japanese. A product with only English or Chinese labeling will be rejected at customs.
- METI notification not completed: Having a PSE certificate but not completing METI notification is a violation. Both must be in place before the product enters Japan.
Testing Costs and Timeline Estimation
| Compliance Activity | Round PSE (Class B) | Diamond PSE (Class A) | Timeline |
|---|---|---|---|
| J Standard Testing (basic product) | $300�?800 | $500�?1,200 | 2�? weeks |
| J Standard Testing (complex product) | $800�?1,500 | $1,500�?3,500 | 3�? weeks |
| Factory Inspection (CAB audit) | Not required | $1,000�?3,000+ (travel costs extra) | 1�? days (on-site) + 2�? weeks (report) |
| Certificate Issuance | Self-issued ($0) | $300�?800 (CAB fee) | 1�? weeks after passing |
| METI Notification Filing | $0�?500 (if using agent) | $0�?500 (if using agent) | 1�? weeks |
| Japanese Label Design + Translation | $100�?300 | $100�?300 | 3�? business days |
| Typical Total | $500�?1,600 | $2,500�?7,000 | Round: 3�? weeks Diamond: 6�?2 weeks |
Expedited testing is available at most CABs for a 50–100% surcharge, reducing testing timelines to 5–10 business days. For lithium-ion battery products, testing to JIS C 8712 adds approximately $800–$1,500 and 2–3 additional weeks.
Common Misconceptions About PSE
- Myth: "If my product has CE/FCC certification, I don't need PSE."
Reality: CE and FCC certifications are not recognized by METI for PSE purposes. Japan requires compliance with Japanese J standards and the DENAN Law, which are separate regulatory frameworks with distinct technical requirements �?particularly around 100V operation, Japanese plug standards, and Japanese-language labeling. - Myth: "Only Diamond PSE products need METI notification."
Reality: METI notification is required for both Diamond PSE and Round PSE products. The notification requirement stems from the DENAN Law, not from the mark type. - Myth: "USB-powered (5V) products are exempt from PSE."
Reality: A product solely powered by USB (5V DC) and sold without an AC adapter is generally not regulated under DENAN Law. However, if sold with an AC adapter, the adapter itself requires PSE certification. Additionally, products containing lithium-ion batteries (even USB-rechargeable) fall under JIS C 8712 requirements. - Myth: "I can test once and the PSE certification is valid permanently."
Reality: Diamond PSE certifications require periodic factory surveillance (typically every 2�? years). Round PSE self-declarations must be based on current test standards �?if the J standard is revised, re-testing may be required. METI also requires periodic re-notification when manufacturing locations or product designs change significantly. - Myth: "Amazon Japan doesn't check PSE for FBA products."
Reality: Amazon Japan's Fulfillment by Amazon (FBA) warehouses are subject to the same compliance requirements as merchant-fulfilled listings. In fact, FBA shipments undergo additional scrutiny at Japan Customs because the importer of record for FBA shipments is typically Amazon's designated broker, and customs holds can result in entire shipment rejection.
Key Takeaways
Japan PSE Compliance Checklist
- Classify your product correctly �?Diamond PSE (116 categories) vs Round PSE (341 categories). Misclassification is the most common and expensive mistake.
- Testing must be against Japanese J standards, not IEC �?engage a METI-registered or MRA-designated CAB.
- METI notification is required within 30 days of first import for both Diamond and Round PSE products.
- All labels must be in Japanese �?PSE mark, METI number, voltage, power consumption, manufacturer name.
- Amazon Japan pre-approval is required for restricted electrical categories �?do not list before obtaining approval.
- Budget $500�?1,600 for Round PSE and $2,500�?7,000 for Diamond PSE, plus 3�?2 weeks timeline.
- Japan Customs will seize and destroy non-compliant shipments �?do not attempt to ship without proper certification.
Frequently Asked Questions
What is the difference between Diamond PSE and Round PSE?
Diamond PSE applies to 116 categories of higher-risk "Specified Electrical Appliances" (Class A) and requires mandatory third-party testing and factory inspection by a METI-registered CAB. Round PSE covers 341 categories of lower-risk "Non-Specified Electrical Appliances" (Class B) and allows manufacturer self-declaration based on testing to Japanese J standards.
Do I need METI registration as a foreign seller?
Yes. The DENAN Law requires the foreign manufacturer or Japanese importer to register as a Notifying Supplier within 30 days of first import. Your Importer of Record typically handles this, and Amazon Japan will request the METI notification number for compliance verification.
Can I use CE or FCC test reports for PSE certification?
No. Japan requires compliance with Japanese J standards (JIS/J standards), which differ from IEC, EN, and FCC standards. Testing must be conducted by a METI-recognized CAB to the applicable J standards, though CE/FCC reports can sometimes serve as supplementary evidence during gap analysis.
How long does PSE certification take?
Round PSE typically takes 3�? weeks from sample submission to self-declaration. Diamond PSE requires 6�?2 weeks, as it includes factory inspection by a CAB. METI notification adds 1�? weeks. Expedited testing is available at a premium.
What products commonly fail PSE certification?
The most frequent failure categories are: USB chargers not tested at 100V, lithium-ion battery packs lacking JIS C 8712 overcharge protection, LED lighting exceeding VCCI EMI limits, heating appliances with inadequate thermal cutoffs, and products with non-Japanese plugs or missing Japanese-language labeling.
Can I sell on Amazon Japan without a PSE mark?
No. Amazon Japan strictly enforces PSE requirements. Electrical products in regulated categories are suppressed and removed if PSE documentation is not provided. Restricted categories require pre-approval before listing. Japan Customs will also seize non-compliant shipments at the border.
The Complete PSE Compliance Pack
Get all 6 PDFs in one download: PSE compliance checklist, Diamond/Round classification guide, METI registration flowchart, testing cost calculator, pre-submission audit, and Japanese label template. Includes a "product-type → required PSE mark" decision tree for AC adapters, LED lighting, USB cables, and smart home devices.
Download: Complete PSE Compliance Pack (PDF) Free for Amazon JP sellers · No email gating · 6 PDFs merged into one