To provide a vehicular seat cushion having less manufacturing cost and improved recycling property.

The vehicular seat cushion comprises a seat cushion pad 1 for a seat formed of a resin foam and a reinforcing part 3 for reinforcing the seat cushion pad 1 at its lower end. The reinforcing part 3 has a reinforcing member 5 consisting of a plurality of laminated paper corrugated materials 4, provided at the lower end of the seat cushion pad 1. The reinforcing member 5 is formed so that, with the seat cushion pad 1 fixed to a body 8 on a vehicle body side, each space 4c of the reinforcing member 5 is in inclined vertical attitude with its upper end located gradually on the rear side and a lower face B of the reinforcing member 5 is in horizontal or almost horizontal attitude.