in fig3 to 33 the upper fins 29 are illustrated by solid lines and the lower fins 30 are illustrated by dashed dotted lines fig3 shows a diffused blowing mode in which the upper fins 29 are oriented rightward and the lower fins 30 are oriented leftward as viewed in fig3 fig3 shows a concentrated blowing mode in which both of the upper and lower fins 29 and 30 are oriented rightward as viewed in fig3 fig3 shows an intermediate blowing mode in which a part of the upper fins 29 are oriented rightward and a part of the lower fins 30 leftward as viewed in fig3 so as to obtain center concentrated blowing and a diffused blowing at the same time with this embodiment a seat occupant can select the direction of the blown air at will even though the air spout 2 is narrow in the above mentioned embodiments torque generated by a motor is used for operating an actuator alternatively magnetic force or pressure can be used particularly in an automotive vehicle negative pressure from a suction pipe of an engine may be used further a restoring force of a shape memory alloy can also be used in the above mentioned embodiments each of the fins is shaped like a plate.