Ear microphone capable of adjusting arc degree

The utility model relates to a radian-adjustable ear microphone, comprising a fixing support, a swiveling jib and an ear microphone. The utility model is characterized in that swiveling jib of each side is connected with the support through a radian adjusting device; the radian adjusting device comprises a center shaft installed in the inner cavity of the support, a rotating sleeve, a shaft shift sleeve and a spring; the center shaft, the rotating sleeve and the shaft shift sleeve are coaxially coupled; the swiveling jib is fixed with the rotating sleeve; the center shaft can only rotate in the inner cavity of the support without axial movement, and the rotating sleeve can only rotate around the center shaft without axial movement; the support or the rotating sleeve has a spiral track groove, and the shaft shift sleeve is connected with a sliding pin radially inserted in the spiral track groove; the support or the rotating sleeve has a driving component for generating a axial displacement of the shaft shift sleeve in the rotation course of the rotating sleeve. The utility model can freely adjust the radian of the swiveling jib relative to the support so that the ear microphone can automatically adapt to face width of different people, preventing clamping too closely or too loosely.