Vehicle seat and design method for same

Disclosed is a vehicle seat (1) comprising a seat cushion (2) and a seat back (4), wherein the seat cushion and the seat back are comprised of: a frame structure (8) to be fixed to the vehicle body; and a seating member (10) supported by the frame structure having an elastic deformation property and a vibration damping property and allow an occupant to be seated therein, and wherein the vehicle seat satisfies the following relationship: DS/DF≥20, where DS denotes a deformation amount of the seating member itself in a situation where a load W is applied at a position XS of the seating member, and DF denotes a displacement of a position XF of the frame structure corresponding to the position XS, in a situation where the frame structure is fixed to the vehicle body, and the given load W is applied at the position XF.