PURPOSE: To make a processing dimension and a face angle, etc., accurate and reduce power required for cutting of a chip for facing by making a facing surface flat and restraining the wear of the chip for facing, in the facing of an opening end surface crossing orthogonally to the center line of a boring hole after correcting its diameter.

CONSTITUTION: A facing method for boring hole is that a supporting bar 39 to which chip 38 for facing is fixed on its top end is engaged, so that it can be displaced and operated by a certain distance in the radial direction of a bar body 33, with the bar body 33 on which a chip 35 for boring for correcting the diameter of a boring hole w1 is mounted, and this facing method is carried out by the vertical motion of the bar body 33 and the lateral movement of the supporting bar 39.