To prevent a sink mark (recess) from being made on a rear surface of a press molding.

A method for manufacturing a mineral plate comprises the steps of drying the rear surface of a mineral crude plate (1) before press molding when the plate (1) is press molded by a press molding machine (2) to shape a rugged pattern (3) to manufacture the mineral plate to form a rigid front layer (9), and press molding the plate.