Torque detecting device and electric power steering device

A torque detecting device comprising:

• at least two sets of coil pairs for detecting a relative displacement between a first rotary shaft and a second rotary shaft, which are connected to each other via a torsion bar that generates a twist due to an input torque, by corresponding the relative displacement to a change in impedance;
• a plurality of oscillators, independently provided for each of the coil pairs, each for supplying a magnetization signal with a different magnetization frequency to each of the coil pairs, and
• a signal processing unit, independently provided for each of the coil pairs, each having a torque detection function for processing an output signal from each of the coil pairs and outputting a torque detection signal,
• wherein a magnetization frequency difference, which is a difference between the magnetization frequencies, is set to 3.5 kHz or higher.