A milling tool comprising a milling tool holder and at least one cutting insert (20a; 20b; 20c; 20d; 20e); the milling tool holder comprising: at least one cutting insert pocket adapted for receiving a cutting insert, characterized in that the cutting insert pocket comprises: a seat face configured to engage a bottom surface of a cutting insert and at least three insert-engaging pocket walls (5a, 5b, 5c) configured to engage portions of a side surface of a cutting insert; the insert-engaging pocket walls (5a, 5b, 5c) being formed by flat planes each formed at an angle (α) of larger than 90° to the seat face; the insert-engaging pocket walls (5a, 5b, 5c) being formed at the same angle (α) with regard to the seat face; intersection lines of the respective insert-engaging pocket walls (5a, 5b, 5c) with a plane in parallel to the seat face extending such that: a first intersection line corresponding to a first insert-engaging pocket wall forms an angle of 90° to a second intersection line corresponding to a second insert-engaging pocket wall, the first intersection line forms an angle of 45° to a third intersection line corresponding to a third insert-engaging pocket wall, and the second intersection line forms an angle of 135° to the third intersection line, and wherein the cutting insert is mounted in the milling tool holder such that at least three contacting surfaces of the cutting insert (20a; 20b; 20c; 20d; 20e) are contacting the first insert-engaging pocket wall, the second insert-engaging pocket wall, and the third insert-engaging pocket wall, respectively. a seat face configured to engage a bottom surface of a cutting insert and at least three insert-engaging pocket walls (5a, 5b, 5c) configured to engage portions of a side surface of a cutting insert; the insert-engaging pocket walls (5a, 5b, 5c) being formed by flat planes each formed at an angle (α) of larger than 90° to the seat face; the insert-engaging pocket walls (5a, 5b, 5c) being formed at the same angle (α) with regard to the seat face; intersection lines of the respective insert-engaging pocket walls (5a, 5b, 5c) with a plane in parallel to the seat face extending such that: a first intersection line corresponding to a first insert-engaging pocket wall forms an angle of 90° to a second intersection line corresponding to a second insert-engaging pocket wall, the first intersection line forms an angle of 45° to a third intersection line corresponding to a third insert-engaging pocket wall, and the second intersection line forms an angle of 135° to the third intersection line, and wherein the cutting insert is mounted in the milling tool holder such that at least three contacting surfaces of the cutting insert (20a; 20b; 20c; 20d; 20e) are contacting the first insert-engaging pocket wall, the second insert-engaging pocket wall, and the third insert-engaging pocket wall, respectively. a first intersection line corresponding to a first insert-engaging pocket wall forms an angle of 90° to a second intersection line corresponding to a second insert-engaging pocket wall, the first intersection line forms an angle of 45° to a third intersection line corresponding to a third insert-engaging pocket wall, and the second intersection line forms an angle of 135° to the third intersection line, and wherein the cutting insert is mounted in the milling tool holder such that at least three contacting surfaces of the cutting insert (20a; 20b; 20c; 20d; 20e) are contacting the first insert-engaging pocket wall, the second insert-engaging pocket wall, and the third insert-engaging pocket wall, respectively.