A control apparatus for an automatic transmission prevents friction engagement elements from being kept in an engagement state in accordance with the traveling state of a vehicle when a shift lever is operated to the position where a neutral range is formed, even if the malfunction of a solenoid valves occurs. If the shift range is switched to an N range, an ECU controls an So3 solenoid valve to enter an energized state, and controls a speed change mechanism to enter a non-transmission state, when the ECU judges that vehicle speed V is smaller than an N range forming method changing threshold Vn. The ECU controls an SL1 linear solenoid valve to enter a de-energized state, and controls the speed change mechanism to enter the non-transmission state, when the ECU judges that the vehicle speed V is no less than the N range forming method changing threshold Vn.