Provided is a relay device that can switch conduction of a current flow path between power storage units on and off, and can suppress a decrease in the output of the power storage units if an abnormality occurs. A relay device includes: a conductive path between a first power storage unit and a second power storage unit, the conductive path serving as a path through which a current flows; a switch unit that is switched between an ON state in which a current can flow through the conductive path, and an OFF state in which the conductive path is in a predetermined no current flow state; a coil that is connected in series to MOSFETs constituting the switch unit, and has an inductance component; and a control unit configured to switch off the switch unit if a value detected by a current detection unit is a predetermined abnormal value.