| 1944 | Opened doors as Showa Denki Sangyo Co., Ltd. |
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| 1946 | Started the production of stainless kitchen instruments at Kamiochiai, Shinjuku. |
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| 1950 | Company relocated to Maenocho, Itabashi-ku, Tokyo. |
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| 1951 | Embarked on the production of steel door fittings. |
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| 1951 | Company renamed Showa Koki Co., Ltd. |
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| 1959 | Production of aluminum sashes at Osaka Plant. |
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| 1961 | Full-scale mass production of aluminum products is launched with the help of an extension and reconstruction of the Tokyo Plant. |
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| 1963 | New plant for aluminum products established in Tokorozawa. |
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| 1967 | Construction of fourth-term extension of Tokorozawa Plant (full-automation devices of alumite processes) completed. |
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| 1970 | Construction of a large curtain wall assembly plant completed at the Tokorozawa Plant. |
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| 1971 | The plant became a factory where Japanese Industrial Standards (JIS) displays were permitted. |
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| 1972 | Head office relocated to Maenocho, Itabashi-ku, Tokyo. |
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| 1976 | Awarded the 9th Main Architectural Prize of the Light Metal Association in recognition of a suspension-type curtain wall for the Shinjuku Mitsui Building. |
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| 1982 | A wind pressure testing room (testing building) was completed at the Tokorozawa Plant. |
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| 1983 | Osaka Plant was relocated along with the construction of Akashi Plant. |
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| 1985 | We started production activities using a new production method (SCD method). |
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| 1992 | New Tokorozawa Plant completed. |
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| 1996 | New alumite plant constructed at Tokorozawa Plant. |
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| 1999 | Relocated the head office to Higashikanda, Chiyoda-ku, Tokyo. |
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| 2007 | Relocated the head office to Kanda-Nishikicho, Chiyoda-ku, Tokyo. |
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| 2007 | We founded the Takaoka Design Center. |
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| 2007 | Business partnerships with Rikifuku Building Materials (Kunshan) Co., Ltd officially conclude. |
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| 2007 | Tokorozawa Plant sold, and lease contract concluded. |
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| 2009 | Leaf Japan Co., Ltd. and Showa Koki Co., Ltd. merge operations. |
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| 2011 | Relocated the head office to Taito, Taito-ku, Tokyo. |
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| 2016 | Relocated the head office to Yurakucho, Chiyoda-ku, Tokyo. |
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| 2022 | Relocated the head office to Kanda-Surugadai, Chiyoda-ku, Tokyo. |
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