In a connector provided with a slider for detecting a half-engagement with respect to a mating connector in accordance with a state of the slider, a resin housing includes a slider receiving section for accommodating the slider and a terminal receiving section for accommodating a terminal connected with an electric wire, which are vertically arranged so as to oppose to each other while defining a gap therebetween. A reinforcing wall member is integrally molded with the housing so as to bridge the slider receiving section and the terminal receiving section in at least one side portion of the housing.