In a push-button switch manufacturing method, a key-top end of a pressing element is inserted into a lower-mold recess. A reinforcing plate is placed in the lower mold so that the pressing element extends through a plate through hole of the reinforcing plate. An upper mold and the lower mold are moved toward each other so as to insert the other end of the pressing element into an upper-mold recess for the pressing element, which is provided in a lower surface of the upper mold. A liquid silicone rubber, which contains a component that does not adhere to the upper and lower molds but adheres to the pressing element, is introduced into a cavity, the upper and lower molds are opened to remove a molded product in which an intermediate portion in an axial direction of the pressing element is supported in the plate through hole by the silicone rubber.