An electric connector is provided with a housing attached to an attachment hole of a panel of a casing. The housing includes a housing main body inserted into the attachment hole of the panel and a flange part extending outward from an outer circumferential face of the housing main body. The housing main body has a plurality of fitting ports into which a plurality of cable connectors is fitted, on an outside of the casing. The flange part has a fixed part fixed to the panel. A first water-proof seal is installed to each of the fitting ports, and seals between a circumferential wall of each of the fitting ports and each of the cable connectors. A second water-proof seal is installed around an outer circumferential face of the housing main body, and seals between the housing main body and the panel.