The present disclosure provides a diaphragm set for a stethoscope having a chest piece. The diaphragm set includes a diaphragm having a bottom structure and a side structure connected to an edge of the bottom structure. The bottom structure and the side structure of the diaphragm form a diaphragm cavity for receiving the chest piece of the stethoscope.本發明提供一種膜片組，以用於具有聽診頭之聽診器。該膜片組包含一膜片，該膜片具有一底部結構及一側邊結構，該側邊結構連結於該底部結構之一邊緣。該膜片的該底部結構以及該側邊結構形成一膜片腔，用於容置該聽診器的聽診頭。
