A brushless motor for a vehicle air conditioner has a motor holder having an accommodation portion, a stator having a center piece fastened to a bottom of the accommodation portion and a core on which a winding is wound, and an exciting circuit disposed below the bottom to supply an exciting current to the winding. A terminal of the exciting circuit is upwardly extended to an upper side of the core through a through hole formed in the bottom and a terminal accommodation hole formed in the center piece to be connected to the winding. Liquid having entered the accommodation portion is restricted from falling through the through hole of the bottom by an O-ring disposed to surround the through hole and is drained through a drain opening formed in the bottom. As a result, a connection portion between the terminal and the winding and the exciting circuit are restricted from making contact with liquid.