MOLDING METHOD FOR PLASTIC MOLDED PRODUCT

PROBLEM TO BE SOLVED: To provide a molding method for plastic molded product, capable of accurately transferring a minute pattern of an imprinting surface and improving mold releasability and productivity.SOLUTION: The molding method for plastic molded product includes steps of: heating a transfer surface 61 of a plastic substrate 6 solidified by impregnation with gas while pressing an imprinting surface 51 onto the transfer surface 61 to transfer a structure of the imprinting surface 51 to the transfer surface 61; solidifying the plastic substrate 6 with the imprinting surface 51 being pressed onto the transfer surface 61; and expanding the gas which is released from the plastic substrate 6 by the heating and compressed in a pressed state by releasing the pressed state, and separating the plastic molded product from a mold by use of the expanded gas.