To provide a remote controller which can be easily operated by a user of a toilet stool.

The remote controller 20 comprises a remote controller body 21 and a pair of side plates 22L, 22R detachably mounted on boards 23L, 23R of the body 21. Operation switches 31, 32, 33 and 34 are provided as operating units of a cleaning nozzle and the like on a wood end surface (front surface) 24a of the body 21. The controller 20 is mounted on a front wall surface 15L of a Western style toilet stool 10 in a toilet room. A site plate 22L is removed from the body 21, a blind cap 49 is removed, the plate 22L is mounted on the wall surface 15L via screws 46, and then body 21 is mounted on the plate 22L.