The present invention provides a drilling tool which can restrain the periphery abrasion of the front end and increase the bending resistance in machining drilled hole. Furthermore the roughness and regrinding property can be improved. Furthermore the drilling tool has the advantages of simple structure, easy manufacturing and excellent practicability. The drilling tool is provided with one or a plurality of spiral chip grooves (2) which extend from the front end of tool to the base end side. A step part (4) which is lower than an edge strip part (3) for one step for forming a clearance is provided between the spiral chip grooves (2) and the edge strip part (3). The step part (4) for forming the clearance is not provided at the front end of the tool and is only provided at the base end ofthe tool.