PURPOSE: To form a reamer simultaneously with the forming of a drill part by providing a recessed part on one part of the work metal die forming the drill part and by providing a rolling part with forging crush on the lower part of the thread rolling die to machine the thread part on the shank of the upper side of the drill part.

CONSTITUTION: An excess metal 31 is forced out when the lower end part of the shank 20 providing the head part 21 having the engaging means 22 of a rotary tool at the upper end is machined by both work metal dies and a drill part is formed by cutting the excess metal 31. In this stage the lower limit of the reamer 30 formed along a side edge blade 28 is restricted and the upper side extension part 30a is freely extended to the upper part. The upper limit of the reamer 30 is arranged then by crushing with forging the upper side extension part 30a of the reamer 30 by a forging crush rolling part 17 simultaneously by rolling a thread part 23 on the outer periphery of the shank 20 by the thread rolling part 16 of a rolling die 15. The drill with reamer connecting along the side edge blade 28 of the drill part the reamer 30 having the constant thickness and length of its root part is obtd. with this rolling.