An object of the present invention is to provide a heart rate monitor built-in insert earphone that can be more accurately measured heart rate signal.The front shell has a front housing, a circuit board assembly 20, a rear outer shell 30, and a light guide tube 40, and the front housing extends forward to form a sound guide pipe 11, and the sound guide pipe extends rearward recessed to form at least one optical vitrification tank 12, the circuit board assembly includes a fixed member 21, the circuit board 22, the speaker 23 has an optical sensor 24, the fixing member central portion, sound conducting hole 211 , The circuit board has a fixing part 221, a connecting part 222, and a mounting part 223, the fixing part covers the fixing member, the speaker is attached to the mounting part, and the optical sensor is a light transmitting part corresponds to the reduction vessel, is secured to the stationary outer surface, Kosoto is to cap the front outer end, the light guide tube has a circular tube bottom 41, the tube bottom of the light guide tube, circuit corresponding to the sound conducting hole of the fixing member of the board assembly, set up a sound conducting port 42, of the light guide tube Bottom, corresponds to the light vitrification tank of the front outer shells, projecting to the rear, to form the at least one light vitrification piece 43, the light guide tube is, Toritsukeraru to sound guide tube outside of the front outer shells.(FIG.【課題】より正確な心拍信号を測定できる心拍計内蔵インサートイヤホンを提供する。【解決手段】前外殼１０、回路基板アセンブリ２０、後外殼３０、導光管４０を有し、前外殼は、前方へと延伸し、導音管１１を形成し、導音管は後方へと陥没し、少なくとも１個の光透化槽１２を形成し、回路基板アセンブリは、固定部材２１、回路基板２２、スピーカー２３、光学センサー２４を有し、固定部材中央部には、導音孔２１１を開設し、回路基板は、固定部２２１、連接部２２２、取り付け部２２３を有し、固定部は、固定部材を覆い、スピーカーは、取り付け部に取り付けられ、光学センサーは、前外殼の光透化槽に対応し、固定部外表面に固定され、後外殼は、前外殼後端に蓋をし、導光管は、円形の管底４１を有し、導光管の管底は、回路基板アセンブリの固定部材の導音孔に対応し、導音口４２を開設し、導光管の管底は、前外殼の光透化槽に対応し、後方へと突出し、少なくとも１個の光透化片４３を形成し、導光管は、前外殼の導音管外に取り付けらる。【選択図】図２
