A breathing mask (200, 200'. 200''). The breathing mask (200, 200'. 200'') comprises: a frame (210, 210")； a forehead support frame (230) which is connected to the frame (210, 210'') pivotally to allow the forehead support frame (230) to shift toward the forehead (100) of a patient or shift away from the forehead (100) of the patient； and an adjusting member (220, 220' , 220' ') which is connected to the frame (210, 210' ') rotatably and has an adjusting slope. The forehead support frame (230) has a joining part (235, 235') in contact with the adjusting slope so that the forehead support frame (230) is driven to rotate pivotally through the rotation of the adjusting member (220, 220' , 220"). Through the matching between the adjusting slope and the joining part (235, 235'), the breathing mask (200, 200'. 200") converts the rotation of the adjusting member (220, 220', 220' ') to the shifting of the forehead support frame (230)； and through rotating the adjusting member (220, 220', 220"), the height of the forehead support frame (230) relative to the forehead (100) of the patient can be adjusted. When the breathing mask is used, the forehead support frame (230) can be shifted by rotating the adjusting member (220, 220', 220") with a single hand, so that the patient can find the most comfortable position according to own feelings without help from others conveniently. The breathing mask is simple in structure and comprises a few parts； therefore, the manufacture process is simple, and the manufacture cost is low.
