| 摘要 |
A rotation angle detection device for detecting rotation angle of a rotator to be measured includes magnetic detection elements which are fixed to the circumference of the rotating body to be measured and detect magnetic flux density of magnet which is rotated with said rotating body to be measured. The device can calculate rotation angle of the rotating body to be measured from outputs of the magnetic detection elements. The device also includes magnetic bodies having two edge portions in positions where the magnet is inserted and are arranged along an area where a magnetic line of force of the magnet is formed. In this regard, gaps can be provided between one edge portion of the magnetic body in the direction of rotation center axis of the magnet and one side of the magnet in the direction of rotation center axis, and between another edge portion of the magnetic bodies in the direction of rotation center axis of the magnet and another side of the magnet in the direction of rotation center axis in some degree, and the magnetic detection elements are intermediated in a magnetic line of force which passes through the magnetic bodies.
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