A user-friendly remote control unit for an air conditioner exhibiting excellent operability. Upon receiving an abnormality notification signal for notifying abnormality from an air conditioner (1), or a filter maintenance request signal for requesting cleaning of a filter of the air conditioner (1), the control section (20) of the remote control unit (10) locates abnormality countermeasure items (211) indicating the location of a plurality of pieces of related information which the user requires with regard to the abnormality at the upper position of a menu (21).