To facilitate processing of a busbar, in a relay device equipped with a plurality of mechanical relays.

In the relay device provided with a plurality of mechanical relays 2 each for switching a load circuit 31 for flowing current to an external load, the load circuit 31 is formed at a first busbar 3, a coil circuit for flowing current to a coil of the mechanical relay 2 is formed at the second busbar 5, a relay-driving circuit 41 switching the coil circuit based on an operation signal is mounted on the second busbar 5, the first busbar 3 and the second busbar 5 are laminated to arrange the mechanical relay 2 at a gap between them, a load terminal to be conductively connected with a movable contact at the mechanical relay 2 is connected with the first busbar 3, and a coil terminal 25 connected to the coil in the mechanical relay 2 is connected with the second busbar 5.