Provided is a breathing nose mask system, which comprises a nose mask for coming into close contact with the face of a user and for acting as means for introducing a breathing positive-pressure gas into the nose of the user, a frame for holding the nose mask in a predetermined position, and a headgear to be worn on a head for bringing the frame and the nose mask into close contact with the face. The breathing nose mask system is characterized in that the head gear includes at its leading end a head gear strap for adjusting the length of the head gear, in that the head gear strap includes a head gear fastener for acting as means for connecting/disconnecting means the frame, in that the frame includes a fastener catch for engaging with the head gear fastener, and in that the fastener catch includes a guide made rotationally symmetric on the axis (or rotation) in the direction to receive the head gear fastener. The breathing nose mask system can connect the head gear easily at the wear starting time, can prevent the twist of the head gear being worn, and which can be easily removed at a daily washing time.
