The present invention includes: a boring head (4) containing a lifting-lowering rod (rod) that moves up and down and punches (boring tools) provided at the distal end of the lifting-lowering rod; a receiving base (6) disposed below the boring head (4) and containing a receiving member that receives the punches lowered in conjunction with the down movement of the lifting-lowering rod; a holding frame (14) that expands and holds an object to be processed between the punches and the receiving base (6) in a planar direction intersecting an up-down direction of the lifting-lowering rod, the movement of the holding frame being controlled in two-dimensional directions, namely a front-back direction and a left-right direction orthogonal to the front-back direction, from among the planar directions; and a tape supplying mechanism (8) (buffer material supplying mechanism) that supplies a tape buffer material wider than at least the processing area of the punches between the object to be processed held by the holding frame (14) and an upper surface of the receiving member, from the front-back direction, while shifting the position of the tape buffer material for each lifting-lowering movementof the punches.