To provide a rotation angle detection device and a torque detection device capable of preventing waveform output from MR elements from fluctuating because of difference in terms of material of a semiconductor wafer in the case of using a plurality of semiconductor MR elements.
The plurality of semiconductor MR elements a1 to a3, b1 to b3 are formed on a same cell Wc of the semiconductor wafer W. The semiconductor MR elements a1 to a3, b1 to b3 are provided at positions which differ from each other in a target peripheral direction for a corresponding input/output shaft and face to each other so that signal for outputting in accordance with rotation of the input/output shaft of a detection target generates a predetermined phase difference of an electric angle.
Hideki Kita
Hiroshi Sakamoto