Rotation-angle detecting device capable of detecting absolute angle with simple configuration

A rotation-angle detecting device comprising:

• a rotor;
• a first output mechanism for outputting a first detection signal in response to the rotation of said rotor;
• and
• a second output mechanism for outputting a second detection signal in response to the rotation of said rotor,
• wherein a first transmission gear, and a second transmission gear having intermittent teeth are arranged along the rotation axis on an outer peripheral surface of said rotor, said first output mechanism includes a first output gear that is meshed with said first transmission gear and that rotates on an axis in parallel with the axis of said rotor, and a first output section for outputting the first detection signal in response to the rotation of said first output gear, and said second output mechanism includes a second output gear that is meshed with said second transmission gear and that rotates on an axis in parallel with the axis of said rotor, and a second output section for outputting the second detection signal in response to the rotation of said second output gear, and
• wherein the rotation angle of said rotor is detected as an absolute angle on the basis of the first detection signal and the second detection signal.