Magnetic field detection device

Abstract

To provide a magnetic field detection device capable of adjusting a position of a magnetic sensor even after being attached to an existent device.SOLUTION: A magnetic field detection device comprises: a lid body (110) which covers an opening part (11A) of a housing (11) having the opening part and a space (11B) communicating with the opening part; a magnet (130) which is arranged in the space and can rotate in plan view of the opening part; and a magnetic sensor (150) which is arranged on the lid body at a position facing the magnet and being apart from the magnet, and configured to detect a change in a magnetic field caused by rotation of the magnet. Therein the lid body has a position adjuster (112) capable of moving the magnetic sensor so as to change a facing distance (D) between the magnetic sensor and the magnet.SELECTED DRAWING: Figure 2B

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