The instant disclosure relates to a wire-to-board connector assembly including a board-end connector and a wire-end connector. The board-end connector has a first insulative housing, a pair of restricting components and a pair of elastic elements. The first insulative housing has a transverse portion and a pair of side walls. The pair of restricting components is movably assembled to the pair of side walls, and has a suppressing portion, respectively. The wire-end connector has a second insulative housing and a plurality of wires. Two sides of the second housing have a wing portion and a blocking bump located above the wing portion, respectively. When the wire-end connector is assembled to the board-end connector, the wing portion is located under the suppressing portion, and the blocking bump is disposed before the front end of the suppressing portion so as to limit the displacement of the wire-end connector.