Hiroshi Yagi | Adult Diaper Information Center Japan

Hiroshi Yagi, adult diaper specialist and trainer

Hiroshi Yagi is an adult diaper specialist, trainer and physical therapist. He explains how to choose and use adult diapers by considering physical function, everyday movements, care settings and product features.

After working as a physical therapist for approximately four years, he moved into work involving adult diapers and spent about two years working on a municipal diaper provision program. In 2016, he started Omutsu Takkyubin in Osaka City. In 2017, he launched Adult Diaper Information Center Japan to organize and share information about adult diapers.

Current work and roles

Adult diaper specialist and trainer
Representative, Omutsu Takkyubin
Editor, Adult Diaper Information Center Japan
Founder and editor, World Diaper Organization (WDO)
Chair, Asahi Ward Toilet Beautification Committee
Physical therapist
Former Deputy Representative Director, Japan Welfare and Medical Fashion Association, a general incorporated association; stepped down on November 24, 2025

Areas of expertise

His expertise centers on adult diaper products. He explains the selection and use of pull-on adult diapers, tape-fastened adult diapers, incontinence insert pads, pad-holding underwear and pads for loose stool, taking account of product type and construction, physical condition, toileting movements and the care environment.

His training sessions and talks draw on his knowledge of physical function and everyday movements as a physical therapist, together with practical experience in adult diaper sales and product selection. His audiences include healthcare and care professionals, businesses, local governments and the general public.

Study sessions and training

Adult Diaper Information Center Japan plans and hosts study sessions and online events focused on adult diapers. Guests include Japanese diaper manufacturers, professionals in healthcare, care and welfare, and people working in related businesses.

It has hosted more than 200 of its own study sessions, with over 8,000 attendances in total. Manufacturer-specific sessions give participants opportunities to learn directly from company representatives about product construction, features, selection and use.

He also provides commissioned training for medical institutions, care facilities, professional associations, local governments and businesses. Topics include adult diaper basics, product selection, fitting and continence care.

Selected activities and milestones

2016: Started Omutsu Takkyubin.
2017: Launched Adult Diaper Information Center Japan.
2018: Spoke at MED Japan 2018, a medical presentation event.
2019: The Asahi Ward Toilet Beautification Committee, which he chairs, received a runner-up award at the fourth Japan Toilet Hito Awards.
2020: Expanded the use of Zoom for adult diaper study sessions.
2021–2024: Cumulative attendance at adult diaper study sessions hosted by Adult Diaper Information Center Japan reached 8,000.
2023: Opened the first World Diaper Organization (WDO) website at worlddiaper.info.
2024: The combined social media following of Adult Diaper Information Center Japan reached 10,000.
2025: Helped plan and run O-MU-TSU WORLD EXPO, the International Diaper Forum and an excretion care equipment exhibition at Expo 2025 Osaka, Kansai, Japan.
2025: Helped plan and run O-MU-TSU MUSEUM at H.C.R.2025 at Tokyo Big Sight.
2025: The O-MU-TSU WORLD EXPO press release, for which he handled public relations, received the PR TIMES 2025 Press Release Award for Influence.
2026: Launched the current WDO website at worlddiaper.org to connect readers with adult diaper product information, manufacturer resources and industry news from different markets.

These activities have been covered by television, newspapers and online media in Japan and overseas, including NHK and NHK WORLD-JAPAN.

World Diaper Organization (WDO)

Yagi is the founder and editor of World Diaper Organization (WDO), an independent information website he operates from Japan.

The first WDO website opened at worlddiaper.info in 2023. In 2026, he launched the current website at worlddiaper.org. It helps readers explore adult diaper products, manufacturers and industry developments across different markets, with links to the published sources.

Read the WDO profile and website history ↗

Writing and information sharing

He writes for websites and specialist publications about adult diaper types, construction, selection, use and continence care. In 2026, he also contributed to Ohayo 21, a monthly magazine for care professionals published by Chuohoki Publishing.

His activity-record website documents talks and training, joint projects with businesses, writing, and appearances or coverage in television, newspapers and other media.

How this website is run

Adult Diaper Information Center Japan organizes adult diaper information in a form that people and AI systems can understand, with the aim of helping people reach the information they need.

Its articles contain no affiliate links or performance-based advertising. They organize information across manufacturers using official Japanese manufacturer information, product materials and practical experience, rather than encouraging the purchase of a particular product. The editor also operates an adult diaper sales business, but the articles on this website are not intended to direct sales toward a specific product or manufacturer.

Training, speaking and media inquiries

He welcomes inquiries about staff training at medical institutions and care facilities; talks for local governments, professional associations and businesses; cooperation on product development and planning; article writing; interviews; and media appearances.

Inquire about adult diaper training and talks ↗