A stamp face forming apparatus includes a stamp face forming part including a plurality of heating elements arranged in a direction along a surface holding a porous stamp face material that can be made non-porous by heating, and a drive circuit for controlling heat generating states of the plurality of heating elements to form a stamp face on the stamp face material; and a controller for controlling the drive circuit of the stamp face forming part by adjusting a signal to be applied to the drive circuit such that an amount of heat per dot for a dot to be heated directly adjacent to a dot to be non-heated is less than an amount of heat per dot for a dot to be heated not directly adjacent to the dot to be non-heated in image data for forming the stamp face.