An end mill having a rotation axis defining forward (D F) and rearward directions (D R), and comprising: front and rear ends (14, 16), and a peripheral surface extending therebetween; a cutting portion extending rearwardly from the front end; and a shank portion located rearward of the cutting portion; the cutting portion comprising a tooth extending from the front end to the peripheral surface; the tooth comprising: a rake surface; a convex radial relief surface; a cutting edge formed at an intersection of the rake surface and the convex radial relief surface; a corner comprising a circular arc profile defining a portion of an imaginary circle (Ic) having: a circle center point (C P2), an axial tangent line (L AT) which extends forwardly from the circle center point (C P2) and in a direction parallel with the rotation axis, an axial tangent point (P AT) which is located at an intersection of the circle (I C) and the axial tangent line (L AT), a radial tangent line (L RT) which extends radially outward from the circle center point (C P2) and in a direction perpendicular with the rotation axis, a radial tangent point (P RT) which is located at an intersection of the imaginary circle (I C) and the radial tangent line (L RT), a radial tangent plane (S RT) which extends perpendicular to the rotation axis and in which the circle center point (C P2), the radial tangent point (P RT) and the radial tangent line (L RT) lie, and a radius magnitude measurable from the circle center point (C P2) to the circular arc profile; and a corner relief surface connected to both the rake surface and the convex radial relief surface, and extending rearward of the radial tangent plane (S RT). front and rear ends (14, 16), and a peripheral surface extending therebetween; a cutting portion extending rearwardly from the front end; and a shank portion located rearward of the cutting portion; the cutting portion comprising a tooth extending from the front end to the peripheral surface; the tooth comprising: a rake surface; a convex radial relief surface; a cutting edge formed at an intersection of the rake surface and the convex radial relief surface; a corner comprising a circular arc profile defining a portion of an imaginary circle (Ic) having: a circle center point (C P2), an axial tangent line (L AT) which extends forwardly from the circle center point (C P2) and in a direction parallel with the rotation axis, an axial tangent point (P AT) which is located at an intersection of the circle (I C) and the axial tangent line (L AT), a radial tangent line (L RT) which extends radially outward from the circle center point (C P2) and in a direction perpendicular with the rotation axis, a radial tangent point (P RT) which is located at an intersection of the imaginary circle (I C) and the radial tangent line (L RT), a radial tangent plane (S RT) which extends perpendicular to the rotation axis and in which the circle center point (C P2), the radial tangent point (P RT) and the radial tangent line (L RT) lie, and a radius magnitude measurable from the circle center point (C P2) to the circular arc profile; and a corner relief surface connected to both the rake surface and the convex radial relief surface, and extending rearward of the radial tangent plane (S RT). a rake surface; a convex radial relief surface; a cutting edge formed at an intersection of the rake surface and the convex radial relief surface; a corner comprising a circular arc profile defining a portion of an imaginary circle (Ic) having: a circle center point (C P2), an axial tangent line (L AT) which extends forwardly from the circle center point (C P2) and in a direction parallel with the rotation axis, an axial tangent point (P AT) which is located at an intersection of the circle (I C) and the axial tangent line (L AT), a radial tangent line (L RT) which extends radially outward from the circle center point (C P2) and in a direction perpendicular with the rotation axis, a radial tangent point (P RT) which is located at an intersection of the imaginary circle (I C) and the radial tangent line (L RT), a radial tangent plane (S RT) which extends perpendicular to the rotation axis and in which the circle center point (C P2), the radial tangent point (P RT) and the radial tangent line (L RT) lie, and a radius magnitude measurable from the circle center point (C P2) to the circular arc profile; and a circle center point (C P2), an axial tangent line (L AT) which extends forwardly from the circle center point (C P2) and in a direction parallel with the rotation axis, an axial tangent point (P AT) which is located at an intersection of the circle (I C) and the axial tangent line (L AT), a radial tangent line (L RT) which extends radially outward from the circle center point (C P2) and in a direction perpendicular with the rotation axis, a radial tangent point (P RT) which is located at an intersection of the imaginary circle (I C) and the radial tangent line (L RT), a radial tangent plane (S RT) which extends perpendicular to the rotation axis and in which the circle center point (C P2), the radial tangent point (P RT) and the radial tangent line (L RT) lie, and a radius magnitude measurable from the circle center point (C P2) to the circular arc profile; and a corner relief surface connected to both the rake surface and the convex radial relief surface, and extending rearward of the radial tangent plane (S RT).