A control device for an AC rotating electric machine includes: a temperature detection unit configured to detect a temperature of a protection part; a maximum current adjustment unit configured to adjust a maximum current of an AC rotating electric machine so as to prevent the temperature of the protection part from exceeding a set temperature; an allowable torque calculation unit configured to calculate an allowable torque based on the maximum current adjusted; a torque command adjustment unit configured to adjust a torque command value directed to the AC rotating electric machine based on the allowable torque; an upper limit number-of-rotation calculation unit configured to calculate an upper-limit number of rotations of the AC rotating electric machine based on the maximum current adjusted; and a number-of-rotation adjustment unit configured to adjust the number of rotations of the AC rotating electric machine based on the upper-limit number of rotations.