Abstract: Disclosed is a device for manufacturing resin molded articles for use in optical elements. Said device is provided with: a first mold, which is fixed in place; a second mold that has, on a cavity mold surface, a transfer surface for transferring an optical surface to a molten resin injected into the cavity; a nozzle for injecting a fluid under pressure into the molten resin injected into the cavity, thereby forming a void inside said molten resin; and an ejector pin that is provided in the second mold, protruding from the mold surface thereof, to release a base material from the mold surface. The nozzle is provided on a part of the cavity mold surface other than the transfer surface of the second mold and has a tip formed so as to protrude from the mold surface into the cavity. The ejector pin protrudes at a position between a position corresponding to the tip of the base material nozzle and the end of the aforementioned optical surface on the side on which the tip of the nozzle is disposed.