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ACCELStars is a venture founded by Professor Ueda of the University of Tokyo's Graduate School of Medicine.

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Company ACCELStars, Inc.
Representative Director and CEO Tadashi Miyahara
Our services include Sleep health checkup, sleep hygiene guidance and sleep measurement wearable production and distribution. Also offering sleep testing, programmed medical device development and clinical research support.
Establish August 28, 2020
  • Fukuoka Office
    1-1 Hyakunen Koen, Kurume City, Fukuoka Prefecture
  • Tokyo Office
    7-3-1 Hongo, Bunkyo-ku, Tokyo
    The University of Tokyo 205 Entrepreneur Plaza 205


Tokyo Office
7 minutes on foot from Hongo Sanchome Station towards the University of Tokyo Hospital

Nearest Station
Marunouchi Line "Hongo Sanchome Station" Exit #2

Board of Directors and Executive Officers

Tadashi MiyaharaRepresentative Director, CEO

Tadashi Miyahara is a serial entrepreneur. Since 2015, after working in software and business development at Recruit (now Recruit Holdings), Mr. Miyahara has founded several companies in the digital health, insurance technology, and AI fields, including Health Data Platform where he served as CEO. After the company was integrated, he was put in charge of new business and marketing, leading the group to its exclusive partnership with American company Fitbit Inc. Mr. Miyahara has served as our Board's CEO since May of 2021.

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Tadashi Miyahara

Hiroki UedaDirector, CTO and Founder

Hiroki Ueda graduated from the University of Tokyo's School of Medicine in 2000, and the Graduate School of Medicine in 2004. Mr. Ueda became a team leader at RIKEN in 2003, and a professor at the University of Tokyo's Graduate School of Medicine in 2013. He still serves as a RIKEN Team Leader, as well as a professor at the Graduate School of Information Science and Technology, where he specializes in Systems Pharmacology and Sleep and has been awarded for his work on multiple occasions.

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Hiroki Ueda

Chikanobu KenmaDirector

Director Chikanobu is another graduate of the University of Tokyo. He has worked as part of the faculty of Economics, Department of Business Administration. He has worked for Andersen Consulting as well as the ICP Corporation before moving on to Inspire, where from 2002 to 2008 he rose to become their Executive Vice President. Mr. Kenma has also held external director positions at Euglena, GIFTEE, as well as several other Inspire portfolio companies.

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Shugi Mimitsu

Takuma IwasaExternal Director

With his passion for IoT consumer electronics, Takuma Iwasa joined Matsushita Electric Industrial (now Panasonic) in 2003, where he was assigned to the e-Net Business Division and was involved in the development of Internet-enabled products such as the LUMIX digital camera and DIGA recorder. In 2004, he founded the hardware venture Cerevo Inc. In 2018, Mr. Iwasa established Shiftall, which shortly thereafter became a wholly-owned subsidiary of Panasonic.

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Takuma Iwasa

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