An indexable double-sided milling cutting insert comprising: a top surface, a bottom surface, a through-bore coaxial to a first symmetry axis intersecting the top surface and the bottom surface, a plurality of side surfaces (4a, 4c), a median plane extending perpendicularly to the first symmetry axis and virtually dividing the cutting insert into two halves, a first edge line at the intersection of the top surface with the plurality of side surfaces (4a, 4c), and a second edge line at the intersection of the bottom surface with the plurality of side surfaces (4a, 4c), each of the first edge line and the second edge line comprising: first and second primary major corners (7a, 7b), first and second secondary major corners (8a, 8b), first and second minor corners (9a, 9b), first and second main cutting edges (10a, 10b), first and second secondary cutting edges (11a, 11b), and first and second support edges (12a, 12b), wherein the top and bottom surfaces (2, 3) each comprise a first seat surface region extending to the first support edge and a second seat surface region extending to the second support edge, characterized in that - with reference to the median plane - the first and second support edges (12a, 12b) of the first edge line are located behind the second and first main cutting edges (10b, 10a) of the second edge line and the first and second support edges (12a, 12b) of the second edge line are located behind the second and first main cutting edges (10b, 10a) of the first edge line. a top surface, a bottom surface, a through-bore coaxial to a first symmetry axis intersecting the top surface and the bottom surface, a plurality of side surfaces (4a, 4c), a median plane extending perpendicularly to the first symmetry axis and virtually dividing the cutting insert into two halves, a first edge line at the intersection of the top surface with the plurality of side surfaces (4a, 4c), and a second edge line at the intersection of the bottom surface with the plurality of side surfaces (4a, 4c), each of the first edge line and the second edge line comprising: first and second primary major corners (7a, 7b), first and second secondary major corners (8a, 8b), first and second minor corners (9a, 9b), first and second main cutting edges (10a, 10b), first and second secondary cutting edges (11a, 11b), and first and second support edges (12a, 12b), first and second primary major corners (7a, 7b), first and second secondary major corners (8a, 8b), first and second minor corners (9a, 9b), first and second main cutting edges (10a, 10b), first and second secondary cutting edges (11a, 11b), and first and second support edges (12a, 12b), wherein the top and bottom surfaces (2, 3) each comprise a first seat surface region extending to the first support edge and a second seat surface region extending to the second support edge, characterized in that - with reference to the median plane - the first and second support edges (12a, 12b) of the first edge line are located behind the second and first main cutting edges (10b, 10a) of the second edge line and the first and second support edges (12a, 12b) of the second edge line are located behind the second and first main cutting edges (10b, 10a) of the first edge line. - with reference to the median plane - the first and second support edges (12a, 12b) of the first edge line are located behind the second and first main cutting edges (10b, 10a) of the second edge line and the first and second support edges (12a, 12b) of the second edge line are located behind the second and first main cutting edges (10b, 10a) of the first edge line.