A sealing element, comprising: a sealing structure (21; 41; 51; 91; 101) which exhibits a maximum extension in a longitudinal direction and comprises: a front side which extends in the longitudinal direction and comprises a sealing surface (22; 42; 52; 92; 102) for a sliding contact which forms a seal; and a rear side which extends in the longitudinal direction and faces oppositely away from the front side; and a spring structure (24; 44; 54; 94; 104) on the rear side of the sealing structure (21; 41; 51; 91; 101), wherein the spring structure (24; 44; 54; 94; 104) can be spring-deflected in the direction of the rear side of the sealing structure (21; 41; 51; 91; 101), and wherein the sealing structure (21; 41; 51; 91; 101) and the spring structure (24; 44; 54; 94; 104) are moulded in one piece, and wherein the spring structure (24; 44; 54; 94; 104) comprises a spring portion which extends at a clear distance from the rear side of the sealing structure (21; 41; 51; 91; 101) and overlaps with the sealing structure (21; 41; 51; 91; 101) in the longitudinal direction from a first end to a second end and protrudes from the sealing structure (21; 41; 51; 91; 101) at the first and/or second end, wherein the spring portion is connected to the sealing structure (21; 41; 51; 91) at the first end and second end or forms a self-contained arc, such that the spring structure (24; 44; 54; 94; 104) alone or together with the sealing structure (21; 41; 51; 91) encompasses a free space into which the spring structure (24; 44; 54; 94; 104) can be spring-deflected, characterised in that in a central region between the first end and the second end, the spring structure (24; 44; 54; 94) comprises a supporting region (25; 45) in the form of a bulge which is curved concavely outwards away from the sealing structure (21; 41; 51; 91), and/or the spring structure (54; 94; 104) axially extends along the respective sealing structure (51; 91; 101) from the first end to the second end as an arc which undulates multiple times. a sealing structure (21; 41; 51; 91; 101) which exhibits a maximum extension in a longitudinal direction and comprises: a front side which extends in the longitudinal direction and comprises a sealing surface (22; 42; 52; 92; 102) for a sliding contact which forms a seal; and a rear side which extends in the longitudinal direction and faces oppositely away from the front side; and a spring structure (24; 44; 54; 94; 104) on the rear side of the sealing structure (21; 41; 51; 91; 101), wherein the spring structure (24; 44; 54; 94; 104) can be spring-deflected in the direction of the rear side of the sealing structure (21; 41; 51; 91; 101), and wherein the sealing structure (21; 41; 51; 91; 101) and the spring structure (24; 44; 54; 94; 104) are moulded in one piece, and wherein the spring structure (24; 44; 54; 94; 104) comprises a spring portion which extends at a clear distance from the rear side of the sealing structure (21; 41; 51; 91; 101) and overlaps with the sealing structure (21; 41; 51; 91; 101) in the longitudinal direction from a first end to a second end and protrudes from the sealing structure (21; 41; 51; 91; 101) at the first and/or second end, wherein the spring portion is connected to the sealing structure (21; 41; 51; 91) at the first end and second end or forms a self-contained arc, such that the spring structure (24; 44; 54; 94; 104) alone or together with the sealing structure (21; 41; 51; 91) encompasses a free space into which the spring structure (24; 44; 54; 94; 104) can be spring-deflected, characterised in that in a central region between the first end and the second end, the spring structure (24; 44; 54; 94) comprises a supporting region (25; 45) in the form of a bulge which is curved concavely outwards away from the sealing structure (21; 41; 51; 91), and/or the spring structure (54; 94; 104) axially extends along the respective sealing structure (51; 91; 101) from the first end to the second end as an arc which undulates multiple times.