To provide a torque calibration device of an electric dynamometer wherein a horizontal distance from the center of a rotation part to a hanging position of a weight for calibration is not changed even when a calibration arm is turned from a horizontal position to become on the angle, and an error is not generated in torque calibration.

The tip surface of each calibration arm 16, 17 projecting horizontally from each torque arm 5, 6 has an arc shape in the vertical direction, and each weight support part 18, 19 for supporting each weight 14, 15 for calibration has a string shape, and the upper end thereof is connected to the upper end of the arced surface of each calibration arm 16, 17.