A rotary electric device control device is formed substantially by three signal process flows. A first component is a part generating a 3-phase drive signal supplied from a torque instruction value to an inverter circuit. This is the part from d,q current map to a PWM conversion. A second component detects a drive current value from a motor/generator and feeds back it to the current instruction. This corresponds to a loop for performing coordinate conversion of the drive current and inputting it as a current instruction value to a subtractor. A third component calculates a drive power and rpm of the motor/generator, acquires an estimated torque value, compensates the current instruction value according to the estimated value, and compensates a torque change. This corresponds to a power calculation, an rpm calculation, a torque estimation, and a current instruction compensation unit.