Controller and astride riding type vehicle

The present invention relates to a controller having first and second members being displaceable relative to each other starting from a reference position and having a detection section for detecting a property of a magnetic field to output a signal representative of the relative position of the first and second members, the detection section having a first magnetic field property sensor and a second magnetic field property sensor fixed in the magnetic field for detection, the first magnetic field property sensor being capable of outputting a first detection signal indicative of the reference position, and the second magnetic field property sensor being capable of outputting a second detection signal changing in response to a change of the magnetic flux density