PURPOSE: To enable a porous stamp material to be produced efficiently and inexpensively, by a method wherein a thermoplastic resin powder having rubber- like elasticity or a mixture of the resin powder with a vulcanized rubber powder is mixed with a predetermined amount of particulate fibers, and the resultant mixture is molded and sintered.

CONSTITUTION: In a mixing step A, a thermoplastic resin powder 1 or a mixture of the resin powder 1 with a vulcanized rubber powder 2 is mixed with a predetermined amount of particulate fibers 3. An elastic thermoplastic resin powder such as a flexible polyvinyl chloride resin powder is used as the resin powder 1. An appropriate amount of a plasticizer, a stabilizer or the like is added to the resin powder 1. A powder of NBR, SBR or the like which is previously vulcanized and contains an appropriate amount of a vulcanizing agent or a stabilizer is used as the rubber powder 2. Crystalline cellulose is used as the particulate fibers 3. The mixed powder 4 prepared in the mixing step A is fed to a molding and sintering step B, in which is it packed into a metallic mold, and is molded and sintered by pressing and heating, thereby obtaining a porous stamp material 5 having uniform open pores.