A housing includes a plurality of cavities arranged in a width direction and housing-side engaging portions provided on both end sides in the width direction. A rear holder includes a plurality of insertion holes arranged in the width direction and communicating with the cavities, and holder-side engaging portions provided on both end sides in the width direction to contact the housing-side engaging portions. Terminals are connected to wires arranged from the insertion holes to the cavities. The housing-side engaging portions are arranged to cover the holder-side engaging portions from outside. A guide receiving portion extending in a front-rear direction is provided on an inner surface of the housing-side engaging portion. A guide portion extending in the front-rear direction and to be fit to the guide receiving portion is provided on an outer surface of the holder-side engaging portion.