PROBLEM TO BE SOLVED: To effectively reduce an external noise acquired with a biological sound.SOLUTION: This apparatus comprises: a body (22) an acquisition part (11) which acquires a biological sound and a diaphragm (21) which has a front face in contact with or close to a living body (200) and a rear face holding the acquisition part inside the body. The body comprises a communication part which causes the rear face of the diaphragm to communicate with the air outside the body. This makes it possible to cancel an external noise transmitted to the diaphragm from each of the front face and the rear face.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2018,JPO&INPIT【課題】生体音と共に取得される外部雑音を効果的に低減する。【解決手段】本体部(22)と、生体音を取得する取得部(11)と、生体(200)に接触又は近接する前面、及び取得部を本体部内に保持する後面を有するダイヤフラム(21)とを備える。本体部は、ダイヤフラムの後面と本体部外の外部空気とを連絡させる連絡部を有する。これにより、ダイヤフラムに前面及び後面の各々から伝達された外部雑音を相殺することが可能となる。【選択図】図5
