Wiper-arm connection device, windscreen wiper, and wiping assembly

The invention relates to a connection device (6) between an arm (3) and a wiper blade, said device comprising a connecting element comprising a connection cavity (7), said connection cavity (7) comprising a transverse axis (8) configured to cooperate with an end (5) of the actuation arm (3) to articulate the wiper blade (2) to said actuation arm (3), wherein the transverse axis (8) comprises at least one cavity (11).