An input-key control device is mounted on an apparatus having a plurality of operating modes and controls a plurality of input keys that receive input provided by a user. The input-key control device includes: a key-related-information storage unit that stores the operating modes and key-identifying information in association with each other, the key-identifying information being information for identifying an operable input key; an input-key identifying unit that identifies, when the operating mode is switched, an input key which has newly become operable as a result of the switching of the operating mode by comparing the key-identifying information associated with the operating mode before the switching and the key-identifying information associated with the operating mode after the switching; and a light-emission control unit that causes a lighting manner of a light-emitting element that illuminates the input key identified by the input-key identifying unit to differ from a lighting manner of a light-emitting element that illuminates remaining input key.