To provide a relay circuit in which operating sound of relay is reduced, the length of a wire harness (W/H) can be made short, and weight reduction and cost reduction of the wire harness can be achieved.

The number of winding of a first coil 12 of a first relay part 10 and that of a second coil 22 of a second relay part 20 are changed and the time constant of the first relay part 10 and the second relay part 20 is made different. Even in the case a first contact 11 and a second contact 21 are switched on simultaneously, the switch-on timing of the first contact 11 and the second contact 21 is made shifted, and the sound pressure peak at the time of switching on of the first contact 11 and the sound pressure peak at the time of switching on of the second contact 21 are shifted.

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