To provide a low-cost vehicle seat-use load detecting apparatus with a small number of components.

A magnet 52 is attached to a spring 24 of a seat cushion 2, a connection member 22c is attached to a side arm 22a of a seat cushion frame 22, and a magnetic sensor 53 having a magnetic impedance element is fixed thereon so as to be located directly below the magnet 52. Sitting down onto the seat cushion 2 causes the spring 24 to bend downward, whereby the magnet 52 approaches close to the magnetic sensor 53, and a magnetic field of the magnet 52 is varied, and this is detected by the magnetic sensor 53. The load, applied to the seat cushion 2 by a person sitting down, is detected based on the change in the magnetic field.

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