A carbide end mill which includes three or more wavy peripheral cutting edges (1; 10 to 13) each having alternate crest portions and trough portions, or three or more peripheral cutting edges (1; 10, 17 to 19) each having a plurality of nicks for breaking chips, wherein the carbide end mill includes the peripheral cutting edges, end cutting edges, and gashes each composed of a plurality of gash surfaces; the plurality of gash surfaces include a first gash surface serving as a cutting face of the corresponding end cutting edge, a second gash surface provided on the side toward the rotational center of the tool axis of the end mill, and a third gash surface provided on the peripheral side of the end mill; the length of a connection portion between the second gash surface and the third gash surface is not less than 5% of the tool diameter as measured from the tool rotation axis and less than 20% of the tool diameter; a first gash angle of 15° to 35° is formed between a crossing portion between the first gash surface and the second gash surface, and a plane perpendicularly intersecting the tool axis; a second gash angle of 40° to 60° is formed between a crossing portion between the first gash surface and the third gash surface, and the plane perpendicularly intersecting the tool axis; and when a certain peripheral cutting edge is considered a reference peripheral cutting edge and the peripheral cutting edges each have a corresponding reference phase such that the distance between the reference phases is an amount corresponding to the value obtained by dividing the pitch (8; 4) of adjacent crest portions of the reference peripheral cutting edge or of adjacent intersections of the nicks of the reference peripheral cutting edge by the number of the peripheral cutting edges, at least one of the peripheral cutting edges except the reference peripheral edge has no phase deviation from its corresponding reference phase and the phase of at least one of the remaining peripheral cutting edges deviates from its corresponding reference phase by an amount of at most 5% of the pitch. three or more wavy peripheral cutting edges (1; 10 to 13) each having alternate crest portions and trough portions, or three or more peripheral cutting edges (1; 10, 17 to 19) each having a plurality of nicks for breaking chips, wherein the carbide end mill includes the peripheral cutting edges, end cutting edges, and gashes each composed of a plurality of gash surfaces; the plurality of gash surfaces include a first gash surface serving as a cutting face of the corresponding end cutting edge, a second gash surface provided on the side toward the rotational center of the tool axis of the end mill, and a third gash surface provided on the peripheral side of the end mill; the length of a connection portion between the second gash surface and the third gash surface is not less than 5% of the tool diameter as measured from the tool rotation axis and less than 20% of the tool diameter; a first gash angle of 15° to 35° is formed between a crossing portion between the first gash surface and the second gash surface, and a plane perpendicularly intersecting the tool axis; a second gash angle of 40° to 60° is formed between a crossing portion between the first gash surface and the third gash surface, and the plane perpendicularly intersecting the tool axis; and when a certain peripheral cutting edge is considered a reference peripheral cutting edge and the peripheral cutting edges each have a corresponding reference phase such that the distance between the reference phases is an amount corresponding to the value obtained by dividing the pitch (8; 4) of adjacent crest portions of the reference peripheral cutting edge or of adjacent intersections of the nicks of the reference peripheral cutting edge by the number of the peripheral cutting edges, at least one of the peripheral cutting edges except the reference peripheral edge has no phase deviation from its corresponding reference phase and the phase of at least one of the remaining peripheral cutting edges deviates from its corresponding reference phase by an amount of at most 5% of the pitch.