A seat component has a center portion that contacts the body or legs of a seated occupant, and side portions that contacts neither the body nor legs of the seated occupant. A flow passage has a center vent formed in the center portion, a side vent formed in the side portions, and communication portions that provide communication between the center vent and the side vent within the seat component. The air blown out of a blower is supplied to a seating-face of the seat component from at least one of the center vent and the side vent.