To obtain a machining method for efficiently boring a hole by using a machine in a hard and brittle material such as quartz, glass and a ceramic material with favorable accuracy.

The boring method for boring a hole comprises steps of bonding a piezoelectric plate to a buffer material, then mounting them on the work table of a boring machine and oscillating a drill of the boring machine while oscillating the work table. As the boring machine, a so-called NC machine equipped with a numerical control mechanism is used, and in order to ensure the accuracy of the hole shape to be processed, the machine has a mechanism which recognizes the oscillation range of the drill or the table by image recognition and controls it.