The invention pertains to a telescopic vacuum cleaner suction tube with an outer tube, an inner tube with snap-in depressions that is telescopically arranged in the outer tube, an antitwisting mechanism and an interlocking device with a snap-in element that is disengaged from a snap-in depression by an actuating element situated about diametrically opposite thereof, wherein the interlocking device consists of a bow spring that positively encompasses at least the inner tube and once again engages the snap-in element into the nearest snap-in depression of the inner tube in the telescoping direction under the prestress of a spring. The invention aims to develop a telescopic vacuum cleaner suction tube of the initially cited type that significantly lowers the manufacturing and assembly expenditures of the interlocking device and ensures that the tubes are always securely interlocked and able to withstand shock-like compressive forces, namely while simultaneously providing for an ergonomic handling.