End mill

An end mill comprising a plurality of peripheral cutting edges, wherein

• the plurality of peripheral cutting edges have respective helix angles that are equal to each other,
• at least one of the plurality of peripheral cutting edges is constituted by a partially-uneven cutting edge that includes an uneven edge portion consisting of a nicked portion or a roughing portion,
• the uneven edge portion is provided in only a part of a tooth length of the partially-uneven cutting edge,
• the partially-uneven cutting edge is defined by a tooth A in which the uneven edge portion has a length ranging from 5% of the tooth length to 65% of the tooth length and is provided in a region extending from a shank-portion side end toward a bottom-cutting-edge side in an axial direction of the end mill by a distance corresponding to 70% of the tooth length, a tooth B in which the uneven edge portion has a length ranging from 5% of the tooth length to 65% of the tooth length and is provided in a region extending from a bottom-cutting edge side end toward a shank-portion side in the axial direction of the end mill by a distance corresponding to 70% of the tooth length, or a tooth C in which the uneven edge portion has a length ranging from 5% of the tooth length to 65% of the tooth length, and is provided in a region extending from a center of the tooth length in directions opposite to each other in the axial direction of the end mill by a distance corresponding to 35% of the tooth length,
• each of the plurality of peripheral cutting edges is defined by one of four types of teeth A-D, such that four types of teeth A-D consist of the teeth A-C each of which defines the partially-uneven cutting edge and a tooth D which does not define the uneven edge portion,
• the plurality of peripheral cutting edges are defined by at least two of the four types of teeth A-D, such that each adjacent pair of the peripheral cutting edges adjacent to each other are defined by the teeth that are different in type from each other, and
• the helix angles of the plurality of peripheral cutting edges range from 0° to 5°.