Patent ID: 7161349

Claim:
A magnetic rotation angle sensor for detecting a rotation angle of a detection target, the sensor comprising: a magnet that generates a magnetic flux; a magnetic flux density detection device that detects a magnetic flux density of the magnetic flux; and a yoke that covers outer circumferences of the magnet and the magnetic flux density detection device, one of the magnet and the magnetic flux density detection device rotating together with the detection target, wherein: the magnetic flux density detection device is radially shifted from a rotation center of the detection target; the magnetic flux density detection device has a detection surface that is in parallel to one of a tangential direction and a normal direction of a turning circle of the detection target; and the magnet is magnetized in the one of the tangential direction and the normal direction of the turning circle and is installed on an inner circumferential side of the magnetic flux density detection device to be radially shifted from the rotation center.