Cutting insert and shoulder millng tool

A cutting insert for a shoulder milling tool, the cutting insert comprising:

• a body having a trigonal shape and a median plane extending through the body;
• a first surface, an opposite second surface, and a circumferential surface extending between the first surface and the second surface, the first and second surfaces extending on opposite sides of the median plane;
• and
• at least one cutting edge extending along an intersection between the first surface and the circumferential surface, the at least one cutting edge, as seen in a view towards the first surface, extending along a corner of the cutting insert, wherein the at least one cutting edge includes a main cutting edge, a corner cutting edge, and a surface-wiping secondary cutting edge, wherein the main cutting edge adjoins the corner cutting edge, and the corner cutting edge adjoins the surface-wiping secondary cutting edge, the surface-wiping secondary cutting edge being inclined in relation to the median plane such that a distance to the median plane decreases in a direction toward the corner cutting edge, and wherein the corner cutting edge, as seen in a side view along the median plane and towards the main cutting edge, includes a concave curve.