An adjusting component (120) used for a breathing mask (100) and a breathing mask (100). The adjusting component (120) comprises: a forehead support device (121), the forehead support device (121) being used for providing supporting for the breathing mask (100) which is placed on the forehead of a user, and an adjusting device (122, 200), the adjusting device (122, 200) comprising a main body (210) and a plurality of connecting pieces (220) arranged on the main body (210), and the connecting pieces (220) being capable of being connected with the forehead support device (121) so that the user can select a suitable connecting piece (220) among the plurality of connecting pieces (220) to connect with the forehead support device (121) according to the forehead of the user. Since the plurality of connecting pieces (220) for connecting with the forehead support device (121) are arranged and the user can select a suitable a suitable connecting piece (220) among the plurality of connecting pieces (220) to connect with the forehead support device (121) according to the forehead of the user, the adjusting component (120) can fit with the foreheads of different users to prevent air leakage due to displacement of the breathing mask which is worn by a user during sleep. Besides, the adjusting component (120) has the advantages of simple structure and manufacturing process, less number of parts and low manufacturing cost.Linvention concerne un composant dajustement (120) utilisé pour un masque de respiration (100) et un masque de respiration (100). Le composant dajustement (120) comprend : un dispositif de support de front (121), le dispositif de support de front (121) étant utilisé pour fournir un support pour le masque de respiration (100) qui est placé sur le front dun utilisateur, un dispositif dajustement (122, 200), le dispositif dajustement (122, 200) comprenant un corps principal (210) et une pluralité de pièces de liaison (220) disposées sur le corps principal (210), les
