To provide a seat pad for a vehicle and the manufacturing method improving a sitting feeling and a riding feeling, reducing weight and lowering costs as well.

A seat pad 1 for the vehicle whose entire body is integrally molded with urethane foam is sectioned into at least a front seat part la receiving and supporting the thigh part of a crew member, a rear seat part 1b receiving and supporting the hip part and a side support part 1c raised on both sides of the thigh part and the hip part supporting a sitting posture. While arbitrarily setting the hardness of the urethane foam at the respective parts 1a-1c, the density of the urethane foam forming the rear seat part 1b is set larger than the one of the other parts 1a and 1c.