A seat for a vehicle, comprising a seat cushion and a seat back formed by covering the surface of a seat pad with a surface material, a plurality of vent holes led to the surface of the surface material through the seat pad, a plurality of air outlets projected from the surface of a duct and connected to the vent holes, and a blower force-feeding air in a cabin to the vent holes through the duct and the air outlets. Locking parts projected in the radial direction of the air outlets are fitted to the projected ends of the air outlets. Also, two or more bellows structures are provided in the duct between the two continuous air outlets. In addition, a part of the duct installed on the seat cushion side and the seat back side is bent upward or downward relative to a horizontal plane.