To provide a positioning member for improving discharge of chips and a boring drill of a printed circuit board attached with this member, in boring work of the printed circuit board.

This positioning member 10 is installed in the boring drill 1 of the printed circuit board, and sets the installation height L of the drill 1. The positioning member 10 forms a substantially cylindrical shape, and a through-hole 11 to be detachably installed in a blade part 1a of the drill 1 and/or a shank part 1b, is arranged in its central vicinity. At least one groove 12 is extended toward the rear end side from a tip surface 10a turning to the tip side of the drill 1 along the axis O on its outer peripheral surface 10c.