PURPOSE: To prevent the dislocation of an actuator in the pressure cylinder control device of the shift/select actuator of an automatic speed change gear for a vehicle, by releasing a hydraulic pressure supply line by utilizing a solenoid valve for driving a clutch actuator.

CONSTITUTION: If directions for neutral are given by the command from an electronic control unit, solenoid valves V3, V5 are turned ON to operate a clutch actuator 11, and the clutch is disconnected. Solenoid valves V1, V2 and solenoid valves V9, V10 are turned ON to perform shift release, and then, solenoid valves V3 through V7 are turned OFF to connect the clutch. Next, an emergency changeover solenoid valve Veo is turned ON, and further solenoid valves V3, V6, and V7 are turned ON to perform pressure release. After completion of pressure release, whether or not a given time has elapsed is judged, and after a lapse of the given time, by the solenoid valve for shift and the solenoid valve for selection, the solenoid valves V1, V2 and V8 through V10 are turned OFF to be made free. And, all the remaining solenoid valves are turned OFF.