Abstract: An anchoring dowel has detent lugs which are yieldably connected to a body portion of the anchoring dowel at a merger region and project outwardly beyond the outer circumferential surface of the body portion in a relaxed condition while being at least partly received in a depression of the body portion when the anchoring dowel is inserted into an anchoring hole of a support structure. The lug has an outer face of a saddle-shaped configuration which merges with the outer circumferential surface of the body portion at the merger region, an elongated side face which commences at and merges into a generatrix of the outer circumferential surface at its end which is close to the leading end of the anchoring dowel and having a concave configuration, and an arcuate end face which extends from the merger region in a circumferential direction of the body portion and is curved in the same manner as the outer circumferential surface of the body portion.