A position detecting device is configured to detect a position of a moving member in which a conductive portion and a non-conductive portion having greater electrical resistance than the conductive portion are provided side by side in a predetermined moving direction. The position detection device is provided with an exciting coil and a detection coil that are arranged extending in the moving direction of the moving member. A voltage is induced in the detection coil by a current flowing in the conductive portion due to a magnetic field generated by the exciting coil. A magnitude of the voltage induced in the detection coil varies with a position in the moving direction of the moving member relative to the detection coil. A vehicle steering device is provided with a shaft, a housing, and the position detecting device.