It is aimed to prevent the interference of an external matter with an operating portion of a lock arm. A female connector (10) includes a female housing (11), female terminal fittings (26) to be inserted into the female housing (11) from behind, and a retainer (33) to be mounted into the female housing (11). The female housing (11) includes a lock arm (17) having a rear end part serving as an operating portion (20) for unlocking, and the retainer (33) is formed with a covering portion (35) for covering at least a part of the operating portion (20).