To obtain a dishwasher or sink cabinet with a dishwasher to reduce wear in a water sealing member associated with the opening and closing of a cleaning tank.

The dishwasher comprises a cleaning tank which is provided in parallel for the sink of the sink cabinet and comprise an opening part at its upper part and a lid body to cover the opening part of the cleaning tank in such a way as to freely open and close it, be moved to the side of the sink when opening the opening part, and water-seal the opening part when closing it. The lid body comprises an outer lid, an inner lid supported at the bottom surface of the outer lid in such a way as to be vertically moved, and an operating means to operate the inner lid to be vertically moved. At least either the circumferential part of the opening part of the cleaning tank or the bottom surface of the inner lid opposing to the circumferential part comprises the water sealing member. The operating means lowers the inner lid with respect to the outer lid when closing the opening part of the cleaning tank and elevates the inner lid to the outer lid when opening it.