Abstract: A means for adjusting the set position of the head band in a headset is disclosed.An elastic member is provided fixedly at each end of the head band, said elastic member being designed such that its protuberant portion is able to project out or retract from the side surface of the head band. Also, a plurality of undulate recessions are formed regularly at given intervals along the inner wall of the hole in each flattened tubular body joined to a corresponding earphone unit, said recessions being designed such that the protuberant portion of said elastic member may be elastically engaged in one of them.By this means, the head band can be adjustably secured to the flattened tubular bodies with no fear of causing any incidental dislocation or shift of the set positions of the earphone units relative to the head band. Any desired change of the set position can be effected with ease.