The invention provides a stethoscope and an electronic auscultation device capable of measuring biological sound with a high SN ratio. The stethoscope is provided with a support base and a detection unit supported on the support base and detecting the sound generated from the test object. The detection unit has a piezoelectric film that is opposed to the support base and is arranged to detect at least the sound generated from the test object The part of the sound is curved into a convex shape on the side opposite to the support base. The piezoelectric film is provided with a piezoelectric layer having two main surfaces facing each other, and the main surface on the support base side is provided on the two main surfaces. The first electrode and the second electrode provided on the main surface on the side opposite to the support, the stethoscope detects the deformation of the piezoelectric film due to the sound generated from the object to be measured as a vibration signal .本發明提供一種能夠以高SN比測量生物聲之聽診器及電子聽診裝置。聽診器具備支撐台及支撐於該支撐台並且檢測從被測物產生之聲音之檢測部，檢測部具有壓電膜，該壓電膜與支撐台對向而至少配置於檢測從被測物產生之聲音之部分並且在與支撐台相反的一側彎曲成凸形，壓電膜具備具有彼此對向之2個主表面之壓電體層、設置於2個主表面中的前述支撐台側的主表面之第1電極及設置於與支撐台相反的一側的主表面之第2電極，所述聽診器將由於從被測物產生之聲音而在前述壓電膜中產生之變形作為振動訊號來進行檢測。
