Nasal spreader comprising a metallic material wire which is elastically deformable and shaped so as to form two connected spreader elements (12, 13) and a connecting element that connects said spreader elements (12, 13) to each other, each of said spreader elements (12, 13) comprising: - a first branch configured to rest against a side wall of the user's nose; - a second branch configured to rest against a wall of the septum of the user's nose each of said first and second branches (15, 16) comprises a first end and a second end; - a link connecting the respective first ends of said branches (15, 16) of each of said spreader elements (12, 13) and that is configured to impart to the latters a force for, in use, to open out the lateral wall with respect to the wall of the septum; said spreader elements (12, 13) and said connecting element extending on the same plane; characterized in that: - said wire forms a closed loop and said connecting element comprises two portions of said wire, a first portion of said portions extends from and connects the second ends of the respective second branches of said spreader elements (12, 13) and is adapted to mount, in use, on the nasal septum and a second portion of said portions extends from and connects the second ends of the respective first branches of said spreader elements (12, 13); or - said connecting element extends from and connects the second ends of the respective second branches of said spreader elements (12, 13) and is adapted to mount, in use, on the nasal septum of the user; wherein said nasal spreader is symmetrical with respect to a central axis which in use is aligned with the septum of the nose and that said link has a radius of curvature of a value comprised between 5.5 mm and 7.5 mm; said connecting element is curved and has a radius of curvature comprised between 8 mm and 11 mm and has an overall dimension, in a direction perpendicular to said central axis, extending between 6 mm and 7.5 mm; said nasal spreader has a side dimension, in the direction perpendicular to the central axis, extending is between 16 mm and 22 mm; said nasal spreader has a longitudinal dimension, in a direction parallel to said central axis extending between 21.5 mm and 24 mm; said wire has ends each bent to form a circular curl of a diameter of 4 mm; or - said connecting element extends from and connects the second ends of the respective first branches of said spreader element (12, 13). - a first branch configured to rest against a side wall of the user's nose; - a second branch configured to rest against a wall of the septum of the user's nose each of said first and second branches (15, 16) comprises a first end and a second end; - a link connecting the respective first ends of said branches (15, 16) of each of said spreader elements (12, 13) and that is configured to impart to the latters a force for, in use, to open out the lateral wall with respect to the wall of the septum; said spreader elements (12, 13) and said connecting element extending on the same plane; - said wire forms a closed loop and said connecting element comprises two portions of said wire, a first portion of said portions extends from and connects the second ends of the respective second branches of said spreader elements (12, 13) and is adapted to mount, in use, on the nasal septum and a second portion of said portions extends from and connects the second ends of the respective first branches of said spreader elements (12, 13); or - said connecting element extends from and connects the second ends of the respective second branches of said spreader elements (12, 13) and is adapted to mount, in use, on the nasal septum of the user; wherein said nasal spreader is symmetrical with respect to a central axis which in use is aligned with the septum of the nose and that said link has a radius of curvature of a value comprised between 5.5 mm and 7.5 mm; said connecting element is curved and has a radius of curvature comprised between 8 mm and 11 mm and has an overall dimension, in a direction perpendicular to said central axis, extending between 6 mm and 7.5 mm; said nasal spreader has a side dimension, in the direction perpendicular to the central axis, extending is between 16 mm and 22 mm; said nasal spreader has a longitudinal dimension, in a direction parallel to said central axis extending between 21.5 mm and 24 mm; said wire has ends each bent to form a circular curl of a diameter of 4 mm; or - said connecting element extends from and connects the second ends of the respective first branches of said spreader element (12, 13).