PURPOSE: To obtain a forming mold capable of smoothly absorbing a raw material water content by capillary phenomenon, by blending a large quantity of inorganic fine particles, hygroscopic and organic finely shortened product or fine powder into a synthetic resin containing a blended curing agent, kneading and solidifying the blend in order to form the mold.

CONSTITUTION: A large quantity of inorganic fine particles and hygroscopic and organic finely shortened product or fine powder is blended and kneaded with a synthetic resin containing blended curing agent at a proper amount. In the solidifying and forming stage of synthetic resin by curing agent, the organic product forms hygroscopic net structure and communicated pore is formed among mutual inorganic fine particles. Strength of mold is sufficient and space of continuous pore is formed in the mold.