A lever-type connector has a housing (20) and a linking wall (25) projects from the housing (20) to define a stop for a mating housing (90). A seal ring (70) is mounted adjacent to the linking wall (25) to provide sealing between the housing (20) and the mating housing (90). A lever (60) includes a coupling (61) and arm plates (62) to define a U-shape. The lever (60) is mounted from an outer side to straddle the housing (20). The linking wall (25) is arranged at a position facing the arm plates (62) from inner sides of the arm plates (62). Cam grooves (64) are provided in the arm plates (62) and function as confirmation windows through which the seal ring (70) is visible to confirm whether sealing is ensured.