This case concerns a vibrating membrane and its stethoscope. The invention relates to a vibration film with a flat vibration part having a first surface. The vibration film structure further comprises a soft structure layer arranged on the first surface. When the vibration film is combined with a sound collecting head, the soft structure layer contacts with the sound collecting head to strengthen the air tightness of the combination of the vibration film and the sound collecting head, so as to prevent the sound vibration energy dissipation.本案關於一種振動膜及其所應用之聽診器。本創作涉及具有一平板狀振動部之振動膜，該振動部具有一第一表面。所述振動膜結構更包含一軟性結構層，佈設於該第一表面。該振動膜與一集音頭結合時，該軟性結構層與該集音頭接觸，以加強振動膜與該集音頭之結合氣密性，來防止聲音振動能量散失。
