佐川急便
Nakao was born in Nagasaki Prefecture on June 8, 1969. After graduating from Osaka University of Commerce, he joined Japan Football League club Kawasaki Steel (later "Vissel Kobe") in 1992. He played many matches as defender from first season. However his opportunity to play decreased from 1995. Although he could not play at all in the match in 1996, the club won the 2nd place and was promoted to J1 League from 1997. However he could not play many matches and left the club end of 1997 season. After that, he played for Sagawa Express Tokyo and Sagawa Express Osaka. In 2005, he moved to Sagawa Express Kyoto (later "FC Mi-O Biwako Kusatsu") and became a playing manager. He retired end of 2007 season.