The present invention I provide a long period of time that can be mounted earphone ear canal sensor. A in order to detect a person in to perform chewing behavior (chewing), and a sensor 11 for detecting the movement of the ear canal, the body 30 to be mounted into the ear canal, to the distal end of the body 30, inwardly of the body 30 sound and a set of the light emitting element 34 and light receiving element 35 is passable arranged air between the outer, is positioned inwardly of the body 30, and outputs a sound toward the inside the body 30 to the outside a transmitting device 39, integrated into the rear end of the body 30, the light receiving element 35 is an earphone ear canal sensor 11 including a, and LED41 to light up in conjunction with the carrying out of the light receiving function. .BACKGROUND【課題】長時間の装着が可能なイヤホン型外耳道センサーを提供する。【解決手段】人間の行う咀嚼動作(チューイング)を検出するために、外耳道の動きを検出するセンサー11であって、外耳道に装着されるボディ30と、ボディ30の先端に、ボディ30の内方と外方との間を空気が通過可能に配置された発光素子34および受光素子35の組と、ボディ30の内方に配置され、ボディ30内方から外方へ向けて音声を出力する音声発信素子39と、ボディ30の後端に組み込まれ、受光素子35が受光機能を行うことに連動して点灯するLED41と、を含むイヤホン型外耳道センサー11である。【選択図】図3
