To provide a core drilling device capable of rapidly drilling a plurality of boring holes, particularly those drilled in a row, with a simple structure and easy handling.

A core drilling device comprises a column 16 and a guide head 25 guided height-adjustably by the column 16. A core drilling machine 20 is held on the guide head 25 rotatably in parallel with the column 16. Then, the core drilling machine 20 is held on the guide head 25 so that concrete core produced inside the core drilling machine 20 at the time of drilling can be extracted from the core drilling machine 20 at the position of the upper side guide head 25.