A stamp-face forming apparatus is provided for forming a stamp face. The apparatus has a stamp-face forming unit which is provided with plural heating elements disposed so as to face a surface of a stamp face material, and forms the stamp face on the stamp face material, the stamp face material includes porous material which can be non-porous when heated, and the stamp face material is detachably held in a holding body and is at least partially coated with a film. Further, the apparatus has a controlling unit for controlling the stamp-face forming unit such that an amount of heat per unit area to be applied to a part of the film facing at least one edge portion of the stamp face material is larger than an amount of heat per unit area applied to apart of the film facing the other portion of the stamp face material to be non-porous.