Anchoring device (50) for one end of a roof bar (40) on a longitudinal bar (30), characterized in that it comprises at least a first anchoring means (50A) comprising at least one body (51) secured to the roof bar (40) ending in a first nose defining a bearing surface (53) of the fixed jaw (52) substantially matching the shape of the longitudinal bar (30), said body (51) supporting the movable jaw (54) in displacement, one end (55) of which projects from the body (51) to face the first nose (53), and in that the device (50) comprises at least second anchoring means (50B) comprising stop means (34) formed on or within the longitudinal bar (30); the extreme part (56) of the second nose (55) of the first anchoring means (50A) being shaped to be able to cooperate with said stop (34) of the second anchoring means (50B) under the effect of clamping means (80) mechanically coupled to the roof bar and the movable jaw (54), to ensure the locking of the roof bar (40) on the longitudinal bar (30).
