PROBLEM TO BE SOLVED: To provide an unequal reed end mill capable of measuring a blade diameter by using a micrometer of two-point measurement, even in any place in the axial direction of a blade part, in the unequal reed end mill having a helical tooth made different in a torsion angle by 6×N strips in the tip part side blade part of an end mill body.SOLUTION: A blade part 13 is provided by arranging two sets of helical tooth formed as one set by arranging a helical tooth 13b of the torsion angle &thetas;different from that of the helical teeth 13a and 13c between the helical teeth 13a and 13c of the same &thetas;and &thetas;in the torsion angle, and the helical tooth 13a of a torsion angle &thetas;of a first set, a helical tooth 13d of the torsion angle &thetas;of the second set, the helical tooth 13c of the torsion angle &thetas;(=&thetas;) of the first set, a helical tooth 13f of the second set, the helical tooth 13c of the torsion angle &thetas;of the first set and a helical tooth 13e of the torsion angle &thetas;of the second set, are respectively positioned in a symmetric position of 180°.
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