A connector includes a housing (10) having a flange (31) provided on an outer periphery, a grommet (70) in the form of a resilient tube and to be externally fit on the flange (31), and a slide lever (40) including an operating portion (41) and slide cams (43) projecting from the operating portion (41), supported in the housing (10) and configured to proceed with connection of the housing (10) and the mating housing (100) by the slide cams (43) sliding in the housing (10) due to the pushing of the operating portion (41). The flange (31) includes recessed cuts (34) at outer peripheral locations proximate to the operating portion (41) when the pushing of the operating portion (41) is completed. The grommet (70) includes parts to be fit into the cuts (34).