A magnetostrictive displacement measuring apparatus is proposed, comprising at least one measuring probe which is of flexurally flexible configuration and comprises a waveguide, and comprising a magnetic position marker which couples to the at least one measuring probe in a non-contact manner, wherein the waveguide is supported in an elastic, flexible support tube and the flexible support tube is positioned in a carrier tube, wherein the flexible support tube is, on an outer side thereof, provided with indentations facing the carrier tube and wherein material of the carrier tube is arranged in the indentations.