Ogasawara was born in Morioka on April 5, 1979. After graduating from Ofunato High School, he joined J1 League club Kashima Antlers in 1998. He debuted in April 1998 and played many matches as offensive midfielder from 1999. In 2000, he became a regular midfielder and Antlers won the champions all three major title in Japan; J1 League, J.League Cup and Emperor's Cup first time in J1 League history. At the 2000 Emperor's Cup final, he scored 2 goals and contributed to won the champions. The club also won the champions 2001 J1 League for 2 years in a row. In 2002 J.League Cup final, he scored a winning goal and Antlers won the champions. He was also selected MVP award. He was also selected Best Eleven award in J1 League for 5 years in a row (2001-2005). In August 2006, Ogasawara moved to Italy and signed with Serie A club Messina Peloro on loan. However he could not play many matches.