The invention relates to a connector (3) for assembling a drive arm of a motor vehicle to a windscreen wiper (2), said connector (3) comprising: a connection device (15) designed to interact with a base (10) of a windscreen wiper (2) to reversibly secure the connector (3) to the windscreen wiper (2), a side interface (16) on a side wall (17) of the connection device (15), said interface (16) comprising a second transverse pin (18) designed to be connected to a drive arm, characterized in that the connection device (15) comprises: a first member (26) designed to interact with a housing (11) in the base (10) of the windscreen wiper (2), the first member (26) being connected to the side wall (17) by at least one bridge (23), and at least one side locking tab (22a, 22b) projecting perpendicularly from the side wall (17) in the direction of the housing (11), the side locking tab (22a, 22b) being designed to interact with a side edge (24) of the windscreen wiper (2) arranged on the opposite side to the housing (11). The present invention also relates to a wiper device.