The invention relates to a drilling tool (1) comprising a support shank (2) and an interchangeable cutting insert (3) which is fitted to the support shank (2) and which has an asymmetrical main lip (15) divided into a guide lip (10) having a supporting land (12) and a guide land (23) trailing the supporting land (12), and into a clearance lip (13) having a trailing clearance portion (14), wherein a guide land (28) and a supporting land (29) are formed on the lateral surface of the support shank (2) and continuously extend the guide land (23) and the supporting land (12), respectively, on the cutting insert (3) and additionally guide the drilling tool (1) on the inner wall of a drill hole during a drilling operation.