To simplify attachment/detachment work of a fuse device to/from a load protection circuit.

The fuse device 10 constitutes a part of the lord protection circuit, in which, during a normal operation, a current is supplied to a load via a MOSFET 6 by turning on the MOSFET 6, and in abnormal operation, overcurrent is blocked by the MOSFET 6 and is not supplied to the load by turning off the MOSFET 6. The front end part 3b of a drain lead frame 3, the front-end part 5a2 of a source main terminal 5a, the front-end part 4b of a gate lead frame 4, and the front-end part 5b1 of a source signal terminal 5b are inserted into female terminals 12a, 13a, 11a, 11b, respectively and are fixed, by only the fuse device 10 being moved forward.

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