A terminal fitting (80) includes a projection (92) on an outer surface of a body (81). A housing (10) includes a cavity (11) into which the terminal fitting (80) is to be inserted, a guiding groove (23) into which the projection (92) enters, and an inverted insertion guiding groove (28) into which the projection (92) enters when the body (81) is in an inverted insertion posture. The housing (10) includes an inverted insertion guiding slope (32) formed on a groove surface of the inverted insertion guiding groove (28), inclined in a direction intersecting an inserting direction of the body portion (81) to face the projection (92) and configured such that the projection (92) slides on the inverted insertion guiding slope (32).