PURPOSE: To provide a base material for a pad molded form in which bubbling gas is effectively discharged, no flash is formed at a molded form, and provide also a method for manufacturing the form.

CONSTITUTION: A pad installing surface 11 enclosed by a sidewall is provided at one side of a base material 10, a through hole along the sidewall is provided at the inner surface of the sidewall, and a communicating hole communicating with the through hole is provided by opening at the end of the sidewall. On the other hand, a sealing part 21 bent inward is provided at the peripheral edge of its skin 20, the skin is so arranged oppositely to the installing surface of the material that the sealing part of the skin peripheral edge is substantially brought into contact with the sidewall end of the base material. Then, liquid foaming raw material P is bubbled between the installing surfaces of the skin and the base material to mold the pad stuck to the skin at the foaming surface at the one side of the material.