PROBLEM TO BE SOLVED: To contribute to prevention of occurrence of accidents due to mental and physical conditions of a driver (user) of a bus or a train.SOLUTION: A conductor cap according to one embodiment has a band portion in contact with the forehead of a user, and a chin strap. The band portion and the chin strap include a first electrode pair (151a, 151b) and a second electrode pair (152a, 152b). In the first electrode pair, the second electrode (151b) is configured to be movable on a chin strap (210R) so that an area of a right eye center (P2) comes on a line connecting the first electrode (151a) and the second electrode (151b). In the second electrode pair, the fourth electrode (152b) is configured to be movable on a chin strap (210L) so that an area of a left eye center (P1) comes on a line connecting the third electrode (152a) and the fourth electrode (152b). An eye movement detection unit (15) detects a right eye potential by the first electrode pair (151a, 151b) and detects a left eye potential by the second electrode pair (152a, 152b). Physical and mental conditions (such as drowsiness and mental stresses) of the user are estimated from detection results (pattern of eye potential changes) of the eye movement detection unit (15) to help prevention of accidents and the like.SELECTED DRAWING: Figure 4【課題】ドライバや運転士（ユーザ）の心身状態に起因する事故発生防止に寄与する。【解決手段】一実施の形態に係る車掌帽は、ユーザの額に接するバンド部と、顎紐を有する。バンド部および顎紐には、第１の電極対（151a,151b）と第２の電極対（152a,152b）設けられる。第１の電極対では、第１電極（151a）と第２電極（151b）を結ぶ線上に右眼中央（P2）のエリアが来るように第２電極（151B）を顎紐（210R）上で移動可能に構成する。第２の電極対では、第３電極（152a）と第４電極（152b）を結ぶ線上に左眼中央（P1）のエリアが来るように第４電極（152b）を顎紐（210L）上で移動可能に構成する。眼動検出部（15）は、第１の電極対（151a,151b）により右眼電位を検出し、第２の電極対（152a,152b）により左眼電位を検出する。眼動検出部（15）の検出結果（眼電位変化パターン）からユーザの心身状態（眠気、精神的ストレスなど）を察知し、事故防止等に役立てる。【選択図】 図４
