To provide a correct measuring signal by correcting an error with previously measured data when a load applied to a torque sensor exceeds the linearity of the torque sensor.

The output signal of a strain gauge GA is connected through an amplifier AP to an analog-digital converter ADC. An output terminal of the analog-digital converter ADC and an output terminal of an output circuit CN of a corrected value are connected to the input terminal of an adding signal of an adder AD, and the output terminal of the digital-analog converter DAC is connected to an output terminal OUT of a measuring signal. An analog signal of the output terminal OUT becomes the signal of a value proportional to torque in the correction of linearity even if the torque exceeding the linearity of a torque sensor is applied, so that the correct measurement can be performed irrespective of the size of the torque.