| 摘要 |
A magnetic detection device of which an output can be completely switched over with an external magnetic field is formed in a small size. A detection circuit is formed by forming circuit elements 3a, 3b, 3c, and 3d such as an active element layer and the interconnection layers 33 and 35 on a substrate 2. Then, an insulating layer 4 is formed on the detection circuit, and a flat surface 4a is formed on the resultant surface. Next, a magnetic detection element 10 which detects an external magnetic field by using a magneto-resistance effect and a fixed resistance element 20 which has the same electric resistance as the magnetic detection element 10 but does not react to the external magnetic field are formed on the flat surface 4a. Electrode layers 15 and 16, and a lead layer 17 are formed on the flat surface 4a, and then the lead layer 17 and the interconnection layer 35 are electrically connected to each other via a bump 5 penetrating the insulating layer 4. Consequently, the magnetic detection element 10 and the fixed resistance element 20 are formed on the flat surface 4a of the insulating layer 4, thereby forming a small magnetic detection device 1.
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