A dehumidifying radome vent in open communication between a radome and the external environment for passively ventilating and dehumidifying the radome. The piston may be disposed within the cylinder bore and may be reciprocally displaceable from a first position to a second position during an intake stroke. This low-viscosity photocurable resin composition has excellent dry etching resistance and is applicable to optical nanoprinting. A locking member extends from the wall into the cavity. or less, thereby achieving a low-cost device with high carrier mobility. A fan motor assembly is installed inside the appliance chamber of the case for forcedly sucking the air inside the appliance chamber and discharging the air.