To provide an end mill for which swarf discharge properties and end cutting-edge damage resistance are favorable, even under processing conditions where the discharge amount of swarf is large. An end mill 10 is provided with: an end cutting-edge 2 that is disposed on the distal end side of an end mill body 1 having a rotation axis O; outer circumference cutting edges 5; and swarf discharge grooves 7 that extend in a spiral shape. In a cross-section along the rotation axis O of the end mill body 1, there are a plurality of the outer circumference cutting edges 5 and a plurality of the swarf discharge grooves 7, alternatingly disposed from the distal end side towards the base part side. The distance (ta, tb) between the deepest location p of each swarf discharge groove 7 and the rotation axis O is the same. The swarf discharge grooves 7 include: a first region 20 that is disposed on the outer circumference cutting-edge 5 side and that includes the deepest location p; a second region 21 that is disposed on a heel 3 side; and a boundary 22. The distance uc from the rotation axis O to a boundary 22c of the base part side is greater than the distance ua from the rotation axis O to a boundary 22a of the distal end side.