A seat cushion pad composed of polyurethane foam having a skin layer and a core layer, the polyurethane foam is molded by pouring a polyurethane foam raw material composition into a mould, the seating portion of the seat cushion pad has a one layer structure, wherein the air permeability is 0.05-1.5 cfm (cubic feet/min, i.e., ft3/min) [1.41 to 42.2 L/min], and the hysteresis loss of the core layer is 17% or below.