Abstract: The invention relates to a breathing aid for swimmers, having a mouthpiece (1) which has an exhalation valve, wherein, starting from the mouthpiece, a two-part air hose (9, 10) leads to a head part (2) which receives the respective hose ends of the two-part air hose. According to the invention, the head part (2) has a frame-like, resilient supporting surface (20) which, when used, rests against the back of the swimmer's head. Provided in the head part is a recess for an inhalation valve (7), wherein the recess having the inhalation valve is located opposite the supporting surface. Furthermore, in at least one of the air hoses there is an insert (8) for length adjustment, and the inhalation and exhalation valves are each embodied in the form of a flutter valve and are also preferably configured with identical structures.