A RESPIRATORY MASK SYSTEM IS PROVIDED, IN WHICH WHILE WEARING A RESPIRATORY MASK SYSTEM, FORCE GENERATED BY MOVEMENT OF A USERS HEAD AND THE LIKE TO INDUCE LATERALLY SLIPPING A MASK CUSHION (4) MAY BE REDUCED OR ABSORBED. A RESPIRATORY MASK SYSTEM, WHICH IS PROVIDED WITH A MASK CUSHION (4) COVERING A NOSE, A NOSE AND A MOUTH OR A FULL FACE, A FIRST FRAME (6) CONNECTED WITH THE MASK CUSHION (4) ENABLING TO SUPPLY RESPIRATORY GAS UNDER POSITIVE PRESSURE FROM A MEANS FOR SUPPLYING RESPIRATORY GAS UNDER POSITIVE PRESSURE, AND A SECOND FRAME (10) CONNECTED WITH A HEADGEAR STRAP, IN WHICH THE MASK CUSHION (4) IS PLACED ON A FACE SIDE OF THE FIRST FRAME (6), THE FIRST FRAME (6) IS PLACED ON A FACE SIDE OF THE SECOND FRAME (10), A SLIDE SURFACE (7) IS FORMED AT LEAST A SIDE OF THE FIRST FRAME (6) FACING THE SECOND FRAME (10) OR A SIDE OF THE SECOND FRAME (10) FACING THE FIRST FRAME (6) AND THE FIRST FRAME (6) IS CONNECTED SLIDABLY WITH THE SECOND FRAME (10) ALONG THE SLIDE SURFACE (7). (FIG. 3)
