Abstract: An improved stethoscope having a reversible breastpiece comprises two base discs with an intermediate element relatively rotatable with respect thereto about the axis of the base discs to position its sound inlet channel with an outlet channel from the base discs. The channels in the base discs are arcuately spaced apart at extremes of relative rotational movement of the intermediate element. The sound inlet channel in the intermediate element, in turn, cooperates with nipples or fittings connected to the ear yoke. Means is provided to limit the amount of relative rotation of the intermediate element relative to the base discs, and positioning means is provided to releasably engage the intermediate element in a selected position of rotation against inadvertent misalignment. As can be seen, the several parts can be relatively easily fabricated with a high degree of precision and assembled in a fashion that enables optimal sound transfer from the selected one of the base discs.