To provide an electric power steering device which has a plurality of dead time (DT) compensation functions that perform DT compensation, wherein the DT compensation functions are switched between toperform compensation in accordance with the steering state and function, thereby improving steering performance, distortion of the current waveform, and responsiveness of current control. A vector-controlled electric power steering device in which a motor is driven and controlled by an inverter, and which applies assist torque to a steering mechanism of a vehicle, wherein said device comprises a compensation function 1 which provides DT compensation on the basis of the motor terminal voltages for each phase and a duty instruction value, a compensation function 2 which performs DT compensationon the basis of a steering assistance instruction value, a compensation function 3 which provides DT compensation on the basis of a dq-axis current instruction value, and a temperature detection unitwhich detects the temperature of the ECU, and wherein correction of DT compensation is carried out on the basis of the temperature, switching between compensation functions is carried out by means ofsoftware condition branching and gradual change switching, the dq-axis DT compensation values after condition branching and gradual change switching are computed, and the dq-axis voltage instruction values are compensated for using the dq-axis DT compensation values.