World Diaper Organization (WDO) is an independent information website personally operated by Hiroshi Yagi in Japan. It is not a public body or a manufacturer membership association. It presents information about companies and products based on publicly available sources. Listing a company does not imply its membership, affiliation, sponsorship or endorsement of WDO.
Founder & editor · Based in Japan
Hiroshi
Yagi
Connecting the world through better diaper information.
An adult diaper specialist and physical therapist whose work spans product selection and public projects exploring what these products could become.
The work behind the website
From everyday care to a wider conversation
Yagi’s perspective began in physical therapy and adult diaper supply. He has since built places where care professionals, manufacturers and the public can examine products, design and choice together.
After approximately four years as a physical therapist, Yagi became involved in adult diaper supply, including a municipal provision programme. In 2016, he started an adult diaper business in Japan.
He launched Adult Diaper Information Center Japan, a Japanese-language adult diaper information website, in 2017. It covers adult diaper types, product design and practical use across manufacturers.
Adult diaper information website in Japan
Launched Adult Diaper Information Center Japan, a Japanese-language website covering adult diaper products and practical use.
First WDO website
WDO’s first website opened at worlddiaper.info, with an introduction to the project.
Public events on a world stage
Helped plan and run diaper-focused events at Expo 2025 Osaka and HCR 2025.
Launch of the current WDO website
Launched worlddiaper.org, bringing together adult diaper product information, manufacturer guides and industry news with links to original sources.
Public activity · 24 June 2025
A runway opens a conversation about choice
At O-MU-TSU WORLD EXPO at Expo 2025 Osaka, 31 models presented 31 designs. Seven diaper manufacturers and one underwear company explored new ways to combine adult diapers, absorbent pads and clothing.
Denim-inspired details and frills showed how appearance can widen personal choice. The runway pieces were experimental proposals; they were not necessarily products available to buy.
Yagi helped plan and run the event while serving as deputy head of the Japan Welfare and Medical Fashion Association. WDO’s article examines the designs, the wearer’s preferences and questions about everyday use, with links to original sources.
Recognition · 2025
The Expo announcement received a PR TIMES award
The association’s announcement of the runway received the 2025 PR TIMES Press Release Award for Influence. Yagi handled communications and is named in the award record.
Attribution: The award was presented to the Japan Welfare and Medical Fashion Association and its team, not to Yagi individually.
See the award record and contributors ↗
His role at WDO
One place to find the source
Yagi selects topics, checks each cited source and helps readers reach the original documents. WDO makes scattered adult diaper information easier to explore. It is not a government body, international agency or membership association.
Editorial transparency
How this work is funded and described
Yagi also operates an adult diaper business in Japan. WDO accepts no sponsorship or payment for coverage and selects stories independently. Mentioning a company or product does not imply endorsement. The English version is the editorial reference; WDO does not provide individual medical or care advice.
Check the record
Selected sources
Event records and reporting in English
Original records in Japanese
Yagi’s published profile · Japanese↗
PR TIMES · Award record and contributors · Japanese↗
PR TIMES · Interview with Yagi · Japanese↗
Some original records about Yagi’s career and the award are available only in Japanese. The English profile summarises the relevant points and links to those records.