| 1939 | Inaugurated as Hiroshima Plant of Toyo Machinery Company and started manufacturing lathes. |
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| 1941 | Toyo Machinery Company has joined the Mitsubishi group. |
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| 1944 | Kyoto Machinery Works of Mitsubishi Heavy Industries, Ltd. established (Uzumasa, Katsura). Started manufacture of cutting tools and engine valves for automobiles. |
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| 1983 | Constructed Ritto Plant in Ritto, Shiga Prefecture in Japan. |
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| 1986 | Constructed the Ritto Universal Machine Manufacturing Plant. |
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| 2003 | Construction of No. 2 machine tool plant. Hiroshima plant moved and integrated to the Ritto plant. |
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| 2005 | Acquired S.R.P. Tools, an Indian cutting tool manufacturer. |
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| 2010 | Began production of gear cutting machines at Mitsubishi Heavy Industries (Changshu) Machinery Co., Ltd. in China. |
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| 2012 | Acquired Federal Broach Holdings, LLC, a U.S. broaches and broach machine manufacturer. |
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| 2015 | Established Mitsubishi Heavy Industries Machine Tool Co., Ltd. as an independent business unit. |
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| 2021 | Joined the Nidec Group and established NIDEC MACHINE TOOL CORPORATION. |
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