Patent ID: 8024923

Claim:
An air cylinder apparatus comprising: an air cylinder comprising a piston operating via action of pressurized air, and pressure chambers that cause the pressurized air to act on the piston, in an inside of a cylinder housing; and a control device that controls the air cylinder while attached to the cylinder housing, wherein the control device is constructed by attaching an electromagnetic valve that supplies and discharges the pressurized air to the pressure chambers, a circuit board on which a control circuit that controls the electromagnetic valve is mounted, and a cover that covers the electromagnetic valve and the circuit board, to a device-attaching surface of an adapter plate disposed at one end in a direction of an axial line of the cylinder housing, which faces the direction of the axial line, and wherein the electromagnetic valve is fixed to the device-attaching surface of the adapter plate, and output ports of the electromagnetic valve and the pressure chambers are allowed to communicate with each other through respective air through-holes provided in the adapter plate, wherein the circuit board is attached to an inside of the cover and occupies a position adjoining the electromagnetic valve, wherein the cover is detachably attached to the adapter plate together with the circuit board, and wherein coil terminals of the electromagnetic valve are connected to circular terminals of the circuit board in a plug-in manner when the cover is attached to the adapter plate.