After graduating from University of Tsukuba, he joined Nissan Motors in 1983.
In 1990, he returned to his hometown and joined Japanese Regional Leagues club Kanazawa SC.
In August 1979, when Koshida was a University of Tsukuba student, he was selected by the Japan U-20 national team for the 1979 World Youth Championship and played in three matches.
In December 1980, he was selected by the Japan national team for the 1982 World Cup qualification.
This biographical article related to a Japanese association football defender born in the 1960s is a stub.