Seat pad and method for manufacturing the same

A method for manufacturing a seat pad comprising the step of foam molding the seat pad by pouring a raw material into a mold and by curing the raw material in the mold,

• wherein the seat pad comprises:
• a seat surface for seating configured to have at least a seat cover material thereon;
• side support parts provided on both sides defining a lateral direction of the seat pad;
• a groove structure for containing a part of the seat cover material, at least a part of the groove structure being formed as a lateral groove which extends in the lateral direction on the seat surface, and
• at least one concavity provided between the first end and the lateral groove, extending along the lateral groove, and being separated from the lateral groove by a distance S1 of 20 mm to 80 mm,
• wherein the mold is structured for molding the seat pad with the seat surface facing in a downward direction,
• when pouring the raw material, a cavity bottom surface of the mold is inclined so that the first end of the seat surface is positioned lower than the second end thereof,
• the cavity bottom surface comprises:
• a protrusion for forming the groove of the seat pad,
• a laterally elongated protrusion for forming the lateral groove of the seat pad which consists of a part of the protrusion extending in the lateral direction when the seat pad is viewed in a position for use, and
• a convexity for forming the concavity of the seat pad, which is positioned between the first end and the laterally elongated protrusion, and faces the laterally elongated protrusion, and
• a distance S1′ between the convexity and the laterally elongated protrusion is 20 mm to 80 mm,
• wherein a rising is provided on the laterally elongated protrusion at a position in front of the convexity, and
• the raw material is poured in a state when an engagement member is arranged on a top end of the rising.