The present invention relates to a nasal respiratory mask system comprising: a nasal mask that is tightly attached to the face of a user and serves as means for leading positive-pressure breathing gas to the nose of the user, a frame to keep the nasal mask at a predetermined position, and a headgear that is mounted on the head in order to attach the nasal mask tightly to the face； wherein, the headgear comprises, on the tip thereof, a headgear strap for adjusting the length of the headgear, the headgear strap comprises a headgear fastener that serves as means for connection/disconnection with the frame, the frame comprises a fastener catch that engages with the headgear fastener, and the fastener catch comprises an axisymmetric guide whose (rotation) axis is the insertion direction of the headgear fastener. The present invention provides a nasal respiratory mask system with which a headgear can be easily connected at the beginning of wearing, twisting of the headgear during wearing is prevented, and disassembly upon daily washing is easy.本發明係有關於一種呼吸用鼻罩系統，包含有：鼻罩，與使用者臉部緊貼，用以對使用者之鼻部引導呼吸用正壓氣體；鼻罩套，用以將前述鼻罩保持於預定位置；及，頭罩，配戴於頭部以使前述鼻罩套及前述鼻罩與臉部緊貼；而，前述頭罩於其前端包含用以調節長度之頭罩繫帶，前述頭罩繫帶設有作為與前述鼻罩套之連結解除機構之頭罩扣件，前述鼻罩套具有用以與前述頭罩扣件卡合之扣合部，前述扣合部具有以插入前述頭罩扣件之方向為(旋轉)軸而呈旋轉對稱之導引部。本發明係提供一種呼吸用鼻罩系統，於開始配戴時，可輕易連接頭罩，並避免配戴時發生頭罩之扭轉變形，且日常清潔時之拆卸亦甚為簡易。
