| Jan 1961 | Established IHARA MFG.CO.,LTD. In Hamamatsu.(Capital:2million Yen) |
| May 1961 | Manufacture and sale high-speed lathe (Self-development) |
| Apr 1962 | Relocated to Hamana-gun. |
| Jan 1965 | Relocated to Hamamatsu, and increased capital to 5 million yen. |
| Oct 1969 | Increased capital 10 million yen. |
| Nov 1977 | Increased capital 20 million yen. |
| Feb 1986 | Increased capital 40 million yen. |
| Mar 1992 | Constructed new factory in Miyakoda Technopolis, Hamamatsu. |
| Oct 1992 | Awarded 2PM excellence. |
| Nov 1996 | Founded IHARA MFG. (THAILAND) CO., LTD in Thailand. |
| Jun 2002 | Founded PT.IHARA MFG. INDONESIA in Indonesia. |
| Nov 2003 | Move head office to Miyakoda Factory. |
| Aug 2007 | Constructed Hamakita Factory at Kirari town, Hamamatsu. |
| May 2008 | Founded VIETNAM IHARA MANUFACTURING JSC in vietnam. |
| Jul 2011 | Started Robot industry business by transfering business from M-ALPHA GIKEN CO.,LTD. |
| Jun 2012 | Founded IHARA MFG. VIETNAM in Vietnam. |
| Aug 2013 | Installed solar panels to Hamakita Factory. |
| Sep 2014 | Started mass production of aluminum castings at Hamakita Factory. |
| Apr 2018 | Merged "Kosakai Gokin CO.,LTD" and started aluminum die casting business in Japan. |
| Apr 2020 | Miyakoda 2nd Factory is constructed, and the die-casting business is transferred from Kozakai Factory. |
| Feb 2025 | Installed solar panels to Miyakoda 2nd Factory. |
