To make easier the operation for setting data of deviation in reference direction of a drilling machine relative to the reference line of the drilling and the position of reference point of the drilling machine in an operation controller.

This drilling machine is equipped with a guide shell 6 loaded with a rock borer 9, a boom 15 supporting a guide shell 6, a detector for detecting the work done by a movable portion of the guide shell 6 and boom 15, and an operation controller 50 performing automatic positioning or position indication of a guide shell based on the detected data from the detector during drilling. This drilling machine is equipped with 3 prisms P for position detection, an automatic follow-up type surveying equipment 40 for measuring the position by sequential automatic follow-up of three prism P, and arithmetic operation means for the deviation of reference direction of the drilling machine relative to the reference line of the drilling and the position of reference point J of the drilling machine for a facing 10 based on measuring data by automatic follow-up type surveying equipment 40.