| 1984 | November | Founded in Takamori, Isehara-shi with capital of 1,000,000 yen |
| 1989 | February | Moved head office to Hase, Atsugi City and started operations at 2 factories, Isehara and Atsugi. |
| November | Increased capital to 14,000,000 yen |
| 1993 | November | Head office factory built in Kamikasuya, Isehara-shi, combined 2 former factories at same location |
| December | Increased capital to 20,500,000 yen with capital participation from Tokyo Small and Medium Business Investment & Consultation CO., LTD. (SBIC East Japan) |
| 1995 | May | Increased capital to 27,500,000 yen |
| 1996 | October | Head office building expansion |
| 1997 | March | 1996 Kanagawa Prefecture Excellent Factory Award 1996 Small and Medium Enterprise Agency Director General's Award |
| 2001 | February | Increased capital to 42,500,000 yen |
| March | ISO9002 acquired |
| May | Shimada office opened in Shimada, Shizuoka Prefecture |
| 2003 | April | Obtained ISO9001 certification (transitioned from ISO9002) |
| 2004 | April | Designated as a Kanagawa SME Model Factory |
| 2007 | June | Shimada office building and factory expansion |
| June | Selected as one of the "Top 300 Vibrant Small and Medium-sized Manufacturing Companies 2007 Edition" compiled by the Small and Medium Enterprise Agency of the Ministry of Economy, Trade and Industry |
| 2012 | February | Unitech High Precision established in Singapore |
| 2013 | November | Obtained JIS Q 9100 (Aerospace and Defense Quality Management System) certification |
| 2018 | February | Established manufacturing company Unitech Manufacturing (Thailand) in Thailand |
2018 | March | Established sales company Unitech High Precision (Thailand) in Thailand |
| 2019 | March | Established sales and manufacturing company Unitech Korea Co., Ltd. in South Korea |
2023
| June
| Singapore local sales subsidiary Unitech High Precision closed |
2023
| July
| Ogurigiken Co., Ltd. becomes a subsidiary through M&A |
2024
| June | Unitech High Precision (Thailand) Co., Ltd. merged with Unitech Manufacturing (Thailand) Co., Ltd. |
2025
| September | Head office building expansion |
2025
| November | Thailand's Mititex becomes a group company through a third-party allocation of new shares
|
| 2025 | December | Overseas subsidiary Unitech Korea Co., Ltd. closed
|
