A motor vehicle wiper blade includes a support mount extending in a longitudinal main direction, and including a support for a wiping blade and a tubular body having a longitudinal main axis, a structural element in the form of a longitudinal horizontal strip which is accommodated inside the tubular body, and an element for connecting the blade to a drive arm which is mounted on the support mount and which includes a locking mechanism for locking the structural element in a position in the connecting element. The locking mechanism of the connecting element includes, on the one hand, a longitudinal mechanism for locking the structural element in said position, and on the other hand, an angular mechanism for locking the structural element in said position.