PROBLEM TO BE SOLVED: To provide an electric apparatus in two-power supply system, in which a contact electrode provided in a battery housing section can be prevented from exposure when a main body is fed electricity from an external power supply through a power supply connection port.SOLUTION: An electric apparatus comprises a lid member 14 attached so as to cover a battery port 62o and a power supply connection port 61 both of which are in an outer surface of a main body. The lid member 14 has a through-hole 14o, and can turn around a rotation center so as to be positioned at a first, a second, and a third rotational positions. The through-hole 14o corresponds to the battery port 62o to expose the battery port 62o, only when the lid member 14 is at the first rotational position. Second contact electrodes 15E, 15F corresponds to the battery port 62o to contact outward directed electrodes of batteries 91, 92, only when the lid member 14 is at the second rotational position. The through-hole 14o corresponds to the power supply connection port 61 to expose the power supply connection port 61, only when the lid member 14 is at the third rotational position.SELECTED DRAWING: Figure 13【課題】２電源方式の電気機器であって、電源接続口を介して外部電源から本体が電力供給を受けている場合に、電池収容部に設けられた接点電極が露出するのを防止できるもの提供すること。【解決手段】本体の外面のうち電池用開口６２ｏと電源接続口６１とを覆うように取り付けられた蓋部材１４を備える。この蓋部材１４は、貫通孔１４ｏを有するとともに、回転中心の周りに回転して第１、第２および第３の回転位置をとることができる。蓋部材１４は、第１の回転位置にあるときのみ、貫通孔１４ｏが電池用開口６２ｏに対応して電池用開口６２ｏを露出させる。蓋部材１４は、第２の回転位置にあるときのみ、内面に設けられた第２接点電極１５Ｅ，１５Ｆが電池用開口６２ｏに対応して電池９１，９２の外向きの電極に接触する。蓋部材１４が第３の回転位置にあるときのみ、貫通孔１４ｏが電源接続口６１に対応して電源接続口６１を露出させる。【選択図】図１３
