A nasal cushion (9) for a respiratory mask (20) that comprises a hollow body (1) with an internal chamber (2), and a pair of nasal prongs (4) each connected to and integral with the hollow body (1), said hollow body (1) further comprising a peripheral border (10) comprising a connecting structure (11, 13 12, 14) for fixing or coupling the hollow body (1) to a mask body (20). The connecting structure (11, 13 12, 14) comprises an outer wall (11) and an inner wall (12) separated from each other by an intermediary spacing (15), the outer wall (11) comprising a first radial expansion (13) projecting in the intermediary spacing (15) toward the inner wall (12), and said inner wall (12) comprising a second radial expansion (14) projecting in the internal chamber (2) of the hollow body (1). The nasal mask and cushion according to the present invention are useable for treating respiratory failures or disorders, such as sleep apnoea or the like.
