History
| 1921 | February 11 | Daisuke Hirai left SiberHegner Holding Ltd. to strike out on his own company, Hirai Denki Seisakusyo,
in Osaka and started manufacturing and sales of indicating instruments and meter transformers. Mainly supplied transformers for electric energy measurement of SiberHegner Holding Ltd. |
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| 1930 | Established subcontracting factory in Shimo-gyo Ku, Kyoto City, requested by predecessor concern of Shimadzu Corporation. | |
| 1938 | June | Reorganized as private limited company Hirai Denki Seisakusyo (capital: 1 million Japanese Yen) with rising demand from various fields after World War II and abolished subcontracting factory. Enlarged market as specialized manufacturer. |
| 1942 | February 15 | Reorganized company as HIRAI DENKEIKI Co.,Ltd., present corporate name. |
| 1952 | Increased capital to 5.5 million Japanese Yen. Founded and started to operate transformers assembling plant in Kisshoin, Minami-ku, Kyoto. (present location of head office) |
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| 1954 | February 28 | Increased capital to 8.63 million Japanese Yen. Founded office, warehouse, and factory for instrument. |
| April | Relocated head office and completed integration of sales and manufacturing. | |
| December | Newly constructed factory for mold transformer and carried on a full-scale operation of epoxy mold products. Started business with leading companies in Japan. Expanded/reconstructed testing and manufacturing facilities with repeating capital increase. |
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| 1960 | November | Introduced vacuum prototype epoxy-molding system. At the same time, renovated each factory and strengthened production capacity of epoxy mold products drastically. Capital 20 million yen. |
| 1964 | March | Increased capital 33 million yen. Newly constructed factory in Kameoka City. |
| 2006 | June | Established Tokyo sub-branch office. |
| 2007 | February | Increased capital from 33 million yen to 40 million yen. |
| June | Elevated Tokyo sub-branch office status to branch office. |