To provide a sand mold casting method and the like that improve quality of a product and flexibility in shape of the product.

In a sand mold casting method, at least a part of casting molds 1, 2, into which a molten metal is poured, is composed of a sand mold 2. The sand mold is formed by coagulating a sand with a binder containing a thermosetting resin and thereafter at least a part of the binder is carbonized by exposing the coagulated sand to superheated water vapor.