PURPOSE: To obtain a torque measuring method and its equipment and a torque controller and a dynamometer using the former capable of accurately calculating an effective torque of a motor, of performing accurate torque control of the motor based on the calculated values of said torque and of giving a load with an accurate torque to a target to be measured.

CONSTITUTION: A torque arithmetic circuit 10 calculates the number of revolutions N of a motor, an induced voltage E of the armature of the motor and the torque of a motor 7 based on measured values by resolver 61 or the like. A loss memory table 11 stores, in the form of a three-dimensional table, the torque-converted value Ttoss of a loss which was measured in advance with the induced voltage E and the number of revolutions of the armature of the motor as parameters at constant intervals. A subtraction circuit 12 subtracts the torque-converted value TLOSS of said loss input from the loss memory table 1, from the torque calculated by the torque arithmetic circuit 10 and then corrects it. A torque control circuit 13 torque-controls the motor based on the set point of torque and torque value after correction.