He was a senior police officer after the war and served as chief of the Security Bureau of the National Police Agency from 1968 to 1970, director of the Cabinet Research Office in 1971 and Deputy Chief Cabinet Secretary from 1973 to 1976.
[1] In the 1979 Kawashima was president of the Japan Railway Construction Public Corporation (JRCC).
He was one of six JRCC executives forced to step down in September 1979 when it was revealed that the corporation had used money intended for overtime and other expenses for personal vacations.
In December 1998 Kawashima and Major League Baseball commissioner Bud Selig and signed the revised United States – Japanese Player Contract Agreement, which initiated the "posting system.
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