| 1909 | Founded by Tomekichi Maruyama. Started production of various metals and snaps. |
| 1914 | Moved to Honjo-ku Irie-cho, Tokyo City. |
| 1923 | Burned down due to the Great Kanto Earthquake. |
| 1924 | Moved to 5-1517, Honcho, Funabashi-shi, Chiba prefecture to resume operation. |
| 1933 | High-speed auto pressing machines were introduced from Germany to increase the volume of production and quality. Organized a general partnership company Maruyama Kinzoku Seisakusho. Capital: 50,000 yen Representative partner: Tomekichi Maruyama |
| 1944 | Changed name to Maruyama Kinzoku (Maruyama Metal MFG.) and reorganized into a stock company. Capital: 130,000 yen |
| 1948 | Increased capital to 1,000,000 yen. |
| 1950 | His Imperial Highness Takamatsu visited the factory on October 11th. |
| 1953 | Toki Maruyama became the company president. |
| 1965 | Increased capital to 4,000,000 yen. Built and moved to a new main factory at the present location. |
| 1970 | Increased capital to 10,000,000 yen. |
| 1973 | Tomimasa Maruyama became the CEO. |
| 1978 | Increased capital to 30,000,000 yen. |
| 1979 | Celebrated the company's 70th anniversary. |
| 1982 | Awarded from Chiba prefectural government for efforts promoting trade. |
| 1987 | Recognized for “excellent incorporation.” |
| 1990 | Celebrated the company's 80th anniversary. |
| 1993 | Tomimasa Maruyama became Chairman of the Board. Tatsuo Kawakami became CEO. |
| 1995 | Introduced a state-of-the-art production machine from Germany. |
| 2000 | Celebrated the company's 80th anniversary. Conducted recreation trip to Beijing. |
| 2001 | ISO9001 Certified. |
| 2002 | Established a joint corporation (環豊金属有限公司) in China on November 15th. |
| 2004 | Company trip to Shanghai, visited China factory. Mayor of Funabashi City visited our factory on November 24th. 環豊金属 Increased capital from 41,000,000 yen to 65,000,000 yen. |
| 2007 | Started Maruyama Metal's employee ownership program. |
| 2010 | Company trip to Thailand. Celebrated the company's 101st anniversary. |