A load detection sensor unit includes: a load detection sensor which includes a pair of electrodes facing each other with a predetermined gap interposed therebetween and a metal plate covering at least a part of one electrode； and a pressing member that includes a pressing portion pressed against a sheet cushion of a seat device and harder than the sheet cushion, and the pair of electrodes contacts each other when the metal plate is bent in a case in which the pressing portion presses a part of the metal plate.
