To obtain a seat pressure reducing seat on a seat such as a seat, cushion for a motor vehicle, excellent in a seat feeling which provides an excellent seat feeling by reducing pressure on the parts of the ischial tuberosity which affects a seat feeling, is superior in shape stability, and suitably adaptable to thinning.

In a seat provided with a cushion member and a cushion supporting body on which the cushion member is mounted, holes or recessed parts are formed directly below the parts of a 3-D mannequin by JIS-D 4607 corresponding to the ischial tuberosity to which the cushion of the cushion supporting body is mounted. The cushion member mounted to the cushion supporting body is provided in such a way as to be protruded into the holes or recessed parts when seating in the seat pressure reducing seat.