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1958 June Established TOITU Optical Electronics Co., Ltd. in Hatsune-cho, Bunkyo-ku, Tokyo
1960 January Moved to Udagawa-cho, Shibuya-ku
1962 April Established TOITU Kogyo Co., Ltd. in Kosugi, Kawasaki City as a manufacturing division (Kosugi Factory)
1963 October As a specialized manufacturing department for OB-GYN suction devices, the Hirama branch factory was opened in Hirama, Kawasaki City
1964 April Moved the head office to its current location, Ebisu, Shibuya-ku
1966 July Relocated TOITU Kogyo Co., Ltd.(Kosugi Factory)  from Kosugi, Kawasaki City to Chitose Shincho in the same city (Shinjo Factory).
1969 August Company name changed to TOITU Co. Ltd.
1970 March Constructed a new building for TOITU Kogyo Co., Ltd. in Tsunashima,  Yokohama City (Tsunashima Factory) and integrated the Hirama Branch Factory into it 
1980 October TOITU Kogyo (Tsunashima Factory) received an award as an excellent factory in Kanagawa Prefecture.
1981 June New head office building (6 floors) completed at current location
1984 April Expanded Toichi Kogyo (Tsunashima Factory)  to 5 floors
1986 July TOITU Service Center opened in Shanghai, People’s Republic of China.
1986 November TOITU heart rate fetal movement recording device MT-320 won Kanagawa Prefecture Industrial Technology Development Award
1987 November Established TOITU of America in Pennsylvania, USA.
1990 February TOITU Co., Ltd. merged with TOITU Kogyo Co., Ltd.
1998 January Head Office and Tsunashima Factory obtained Repair Business License
1998 September Head office/Tsunashima Factory obtained  ISO9001/EN46001 registration certification
2003 September Head office/Tsunashima Factory obtained  ISO9001/ISO13485 registration certification
2005 February Obtained first-class medical device manufacturing and sales license
2008 August Head office/Tsunashima Factory obtained  ISO9001/ISO13485:2003 registration certification
2009 June Head office/Tsunashima Factory obtained  ISO9001:2008 registration certification
2009 September Reconstructed Tsunashima Factory
2015 November Tsunashima Factory obtained ISO/IEC 27001:2013/JIS Q 27001:2014 registration certification
2019 August Head office/Tsunashima Factory obtained ISO13485:2016 registration certification
2024 May TOITU Core Center and Tokyo metropolitan sales office opened


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