To provide a signal branching device and a device inspection method wherein inspection can be made easily and surely, regarding the signal branching device and the device inspection device to supply the same driving signal to the inspected device by branching and making the inspection of the inspected device by the action of the inspected device.

This is the signal branching device mounted with a plurality of connectors constituted of a prescribed number of connecting terminals, and the plurality of connectors are connected so that the terminal numbers of the prescribed number of the connecting terminals coincide with each other.