Upon using a stethoscope, there is a problem that it had been needed to interrupt work and mount the stethoscope using both hands, resulting in poor work efficiency. Also, when it is needed to repeatedly mount and unmount the stethoscope for such as a group examination, for example, it had been necessary to continuously carry out an operation of expanding ear tubes many times, which is complicated. Thus the present invention provides an attachment for a stethoscope comprising a mounting part (20) which can be mounted to both of ear tubes(3), and a manipulating part (22) for manipulating the mounting part (20), the manipulating part (22) and the mounting part (20) being connected through a rotatable fulcrum, so that the mounting part (20) may be opened and closed by opening and closing operation of the manipulating part (22).【課題】医師等の作業効率を格段に向上させることができる聴診器用アタッチメントを得る。【解決手段】聴診器用アタッチメント10は、上述した聴診器1に装着され、耳管3を拡張状態とするための操作を可能とするためのアタッチメントである。聴診器用アタッチメント10は、一対の操作片12(左操作片14及び右操作片16とも称す)と、ヒンジ部18とを有する。操作部22,22を摘まんで左操作片14の操作部22、及び右操作片16の操作部22を近接させることにより、矢印Aで示すように左操作片14の装着部20及び右操作片16の装着部20の間隔を拡張させることができる。【選択図】図1