A position detection system that does not require calibration measurement to be performed in advance and reduces the work required for detecting a position and so on is provided. The provided position detection system includes a device having a magnetic inductance coil a drive coil that has a position-calculating frequency near a resonant frequency of the magnetic inductance coil and generates an alternating magnetic field which acts on the magnetic inductance coil a plurality of magnetic-field sensors that is disposed outside the operating range of the device and detects an induced magnetic field generated by the magnetic inductance coil amplitude-component detection means (50A) for detecting amplitude components whose phase is substantially orthogonal to the alternating magnetic field from the outputs of the magnetic sensors acquired by the plurality of magnetic sensors and position analyzing means (50C) for calculating at least one of a position and an orientation of the device on the basis of the amplitude components.
