An on-board type connector which includes a housing 20 made of synthetic resin for holding terminals 10, and reinforcing metal plates 50 integrally having parts 54 to be fixed on board and parts 55 to be fixed to the housing which are adapted to be fixed to both sides of the housing 20 in a lateral direction. The housing 20 is provided, at both sides thereof in the lateral direction, with insertion slits 24a which open toward a bottom face of the housing. These parts 55 to be fixed to the housing are restrained from the back and the forth by a restraining part 25 of the housing 20, in a state where the parts 55 have been inserted into the insertion slits 24a from the bottom face side of the housing.