Device for attaching a windscreen wiper and wiper system including said attachment device

The invention relates to a device for fixing a wiper blade (16) on a drive arm (12) of a wiping system (10), said device comprising an end piece (14) of arm (12), a connector (20) intended to be fixed to the blade (16), a connection adapter (50) of the connector (20) to said arm (12), and an intermediate piece (40), said adapter (50) comprising means for holding on the arm in a nominal blocking position, said intermediate piece (40) being movable in said end piece (14) relative to the adapter (50), and comprising means for disengaging and/or locking said holding means, so as to allow assembly and/or disassembly of the adapter (50) on the arm (12) and/or so as to retain the adapter (50) on the arm (12) in nominal blocking position. The invention also relates to a wiping system (10) comprising such a fixing device.