| 1877 | Gonnosuke Sueno founded a pharmacy, "SUENO HACHIMOKU-DO", at 1-39 Karamono-cho Higashi-ku Osaka. |
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| 1891 | Gonnosuke Sueno (the 2nd generation owner) succeeded the family business. |
| 1913 | Started sales of packaging materials for pharmacies to enter the packaging field. |
| 1918 | Started export of sanitary materials to enter trading business. |
| 1920 | Relocated the Office to 1-18-27 Edobori Nishi-ku Osaka (present Head Office' location). |
| 1952 | The name and organization of SUENO HACHIMOKU-DO changed and a company under the name SHOWA BOEKI CO., LTD. established. Akira Sueno (the 3rd) assumed the presidency. |
| 1953 | Began full-scale operation of import of lemons and entered food field. |
| 1958 | Opened Tokyo Branch Office (presently Tokyo Branch). |
| 1964 | Opened Hong Kong Branch Office (presently SHOWA BOEKI (ASIA) CO., LTD.). |
| 1968 | Established SHOWA PHOENIX INDUSTRIAL CO., LTD. |
| 1969 | Opened Holland Business Office (presently SHOWA BOEKI (EUROPE) B.V.). |
| 1974 | Opened New York Business Office (presently SHOWA BOEKI (U.S.A.) CORP.). Showa Building (present Head Office building) completed. |
| 1984 | Akiyoshi Sueno (the 4th) assumed the presidency. |
| 1985 | Concluded an Exclusive Distributor's Agreement with AGIP s.p.a (Azienda Generale Italiana Petroli; Presently ENI s.p.a., ITALY) and launched motor oil sales. |
| 1988 | Started import of nursing-care equipment from Europe to enter healthcare field. |
| 1999 | Relocated Tokyo Branch to 4-13-5 Nihonbashi-Honcho Chuo-ku Tokyo. |
| 2004 | Acquired ISO9001:2000 certification to cover the fields of packaging materials and import/wholesale/distribution of agricultural materials, agricultural produce and foods. Relocated SHOWA BOEKI (U.S.A.) CORP. to Los Angeles. |
| 2009 | Akihiko Sueno (the 5th) assumed the presidency. |