An end mill comprising: an end mill body including a rotation axis; a cutting edge portion located at a front end side of the end mill body; a proximal end portion located at a rear to the cutting edge portion; a shank portion located at a rear to the proximal end portion; two or more end cutting edges located at the front end side of the cutting edge portion; peripheral cutting edges located at a rear to the end cutting edges of the cutting edge portion and extending to the proximal end portion; and chip discharging flutes (7, 7a, 7b, 7c) each located between two peripheral cutting edges and helically extending from the front end side to the proximal end portion, wherein each of a plurality of the peripheral cutting edges and each of a plurality of the chip discharging flutes (7, 7a, 7b, 7c) are alternately located from the front end side to a side of the proximal end portion, and a distance (t, ta, tb, tc) between a deepest position (p, pa, pb, pc) of the chip discharging flute (7, 7a, 7b, 7c) and the rotation axis is set equal among the respective chip discharging flutes (7, 7a, 7b, 7c) in a cross section taken along the rotation axis of the end mill body, the chip discharging flute (7, 7a, 7b, 7c) comprises a first region (20, 20a, 20b, 20c) located at a side of the peripheral cutting edge and including the deepest position (p, pa, pb, pc), a second region (21, 21a, 21b, 21c) located at a side of a heel opposite to the peripheral cutting edge, and a boundary (22, 22a, 22b, 22c) located between the first region (20, 20a, 20b, 20c) and the second region (21, 21a, 21b, 21c); and a distance (uc) from the rotation axis to the boundary (22, 22a, 22b, 22c) located at a most proximal end portion side is larger than a distance (ua) from the rotation axis to the boundary (22, 22a, 22b, 22c) located at a most front end side, the first region (20, 20a, 20b, 20c) comprises a first trace located in the same direction as an advancing direction of the chip discharging flutes (7, 7a, 7b, 7c), and the second region (21, 21a, 21b, 21c) comprises a second trace located in a direction which intersects with a rearward advancing direction of the chip discharging flutes (7, 7a, 7b, 7c) at an acute angle. an end mill body including a rotation axis; a cutting edge portion located at a front end side of the end mill body; a proximal end portion located at a rear to the cutting edge portion; a shank portion located at a rear to the proximal end portion; two or more end cutting edges located at the front end side of the cutting edge portion; peripheral cutting edges located at a rear to the end cutting edges of the cutting edge portion and extending to the proximal end portion; and chip discharging flutes (7, 7a, 7b, 7c) each located between two peripheral cutting edges and helically extending from the front end side to the proximal end portion, wherein each of a plurality of the peripheral cutting edges and each of a plurality of the chip discharging flutes (7, 7a, 7b, 7c) are alternately located from the front end side to a side of the proximal end portion, and a distance (t, ta, tb, tc) between a deepest position (p, pa, pb, pc) of the chip discharging flute (7, 7a, 7b, 7c) and the rotation axis is set equal among the respective chip discharging flutes (7, 7a, 7b, 7c) in a cross section taken along the rotation axis of the end mill body, the chip discharging flute (7, 7a, 7b, 7c) comprises a first region (20, 20a, 20b, 20c) located at a side of the peripheral cutting edge and including the deepest position (p, pa, pb, pc), a second region (21, 21a, 21b, 21c) located at a side of a heel opposite to the peripheral cutting edge, and a boundary (22, 22a, 22b, 22c) located between the first region (20, 20a, 20b, 20c) and the second region (21, 21a, 21b, 21c); and a distance (uc) from the rotation axis to the boundary (22, 22a, 22b, 22c) located at a most proximal end portion side is larger than a distance (ua) from the rotation axis to the boundary (22, 22a, 22b, 22c) located at a most front end side, the first region (20, 20a, 20b, 20c) comprises a first trace located in the same direction as an advancing direction of the chip discharging flutes (7, 7a, 7b, 7c), and the second region (21, 21a, 21b, 21c) comprises a second trace located in a direction which intersects with a rearward advancing direction of the chip discharging flutes (7, 7a, 7b, 7c) at an acute angle.