A nasal mask, comprising: a connector; an elbow connected to the connector; a shell connected to the elbow, wherein the shell is provided with a plurality of protruding latching portions and a plurality of concaved fastening portions at interval, at least a part of the latching portions and the fastening portions form at least two matching structures; a cushion disposed at an end of the shell away from the elbow, wherein the cushion defines a first opening which faces towards the shell and a second opening which is away from the shell, a flexible pad is formed on an edge region adjacent to the second opening; the cushion comprises a nasal bridge contacting area and a nasal wing contacting area, the nasal bridge contacting area concavely forms a buffer structure, the buffer structure is an elongated structure extending from a top end of the nasal bridge contacting area towards the nasal wing contacting area along both sides, the buffer structure comprises a first buffer portion, a second buffer portion, and an inwardly concave surface connecting the first buffer portion and the second buffer portion, the first buffer portion is adjacent to the first opening, the second buffer portion is adjacent to the flexible pad, the inwardly concave surface is deformable to adjust a distance between the first buffer portion and the second buffer portion; a frame removably sleeved on the shell, wherein the frame comprises an engaging portion and a connecting portion extending symmetrically and outwardly from both ends of the engaging portion, the engaging portion defines an engaging hole and is sleeved on the shell through the engaging hole, a latching structure is formed on the engaging portion, the latching structure can be engaged with at least one of the at least two matching structures of the shell, and a headgear connected to the connecting portion of the frame to assist in wearing the nasal mask, wherein when the nasal mask is worn, the connecting portion of the frame is suspendingly placed on a face or a forehead portion of a wearer, such that the frame is not in contact with the skin of the face portion or the forehead, characterized in that each of the connecting portions extends and bends outwardly from said engaging portion, and a bending direction thereof is opposite to a convex direction of the engaging portion, wherein a bending curvature of the connecting portion is gradually decreased along a direction away from the engaging portion, wherein the two connecting portions of the frame are suspendingly placed on an outer side of the face of a person. a connector; an elbow connected to the connector; a shell connected to the elbow, wherein the shell is provided with a plurality of protruding latching portions and a plurality of concaved fastening portions at interval, at least a part of the latching portions and the fastening portions form at least two matching structures; a cushion disposed at an end of the shell away from the elbow, wherein the cushion defines a first opening which faces towards the shell and a second opening which is away from the shell, a flexible pad is formed on an edge region adjacent to the second opening; the cushion comprises a nasal bridge contacting area and a nasal wing contacting area, the nasal bridge contacting area concavely forms a buffer structure, the buffer structure is an elongated structure extending from a top end of the nasal bridge contacting area towards the nasal wing contacting area along both sides, the buffer structure comprises a first buffer portion, a second buffer portion, and an inwardly concave surface connecting the first buffer portion and the second buffer portion, the first buffer portion is adjacent to the first opening, the second buffer portion is adjacent to the flexible pad, the inwardly concave surface is deformable to adjust a distance between the first buffer portion and the second buffer portion; a frame removably sleeved on the shell, wherein the frame comprises an engaging portion and a connecting portion extending symmetrically and outwardly from both ends of the engaging portion, the engaging portion defines an engaging hole and is sleeved on the shell through the engaging hole, a latching structure is formed on the engaging portion, the latching structure can be engaged with at least one of the at least two matching structures of the shell, and a headgear connected to the connecting portion of the frame to assist in wearing the nasal mask, wherein when the nasal mask is worn, the connecting portion of the frame is suspendingly placed on a face or a forehead portion of a wearer, such that the frame is not in contact with the skin of the face portion or the forehead, characterized in that each of the connecting portions extends and bends outwardly from said engaging portion, and a bending direction thereof is opposite to a convex direction of the engaging portion, wherein a bending curvature of the connecting portion is gradually decreased along a direction away from the engaging portion, wherein the two connecting portions of the frame are suspendingly placed on an outer side of the face of a person.