A connector comprising a housing and a mating housing wherein the housing has a housing main body including a fitting protrusion fitted to a tubular hood portion of the mating housing; a sealing member mounted to the fitting protrusion of the housing main body and configured to seal between the fitting protrusion and the fitted hood portion of the mating housing; and the housing has a lock arm including a cantilever-shaped elastic arm portion that extends from an outer peripheral surface of the housing main body to a fitting side with the mating housing and has a locking portion configured to be engaged with and/or disengaged from a locking protrusion formed on the mating housing, wherein a protective wall is formed on an outer surface of the housing main body, and wherein the protective wall is provided over a width direction of the housing main body at a position in the housing main body facing a gap between the hood portion and the housing main body when the fitting protrusion of the housing main body is fitted to the hood portion, the elastic arm portion includes a strut portion formed above the housing main body and connected to the housing main body, a bent portion bent from the strut portion toward the fitting side with the mating housing, and an extending portion extending from the bent portion toward the fitting side of the mating housing, and wherein in the housing, an edge portion of the housing main body on the fitting protrusion side is a fitting edge portion having a larger outer shape than a seal mounting portion, the protective wall is formed at the fitting edge portion of the housing main body on the fitting side with the mating housing, and is formed along the width direction of the housing main body, and wherein a tip end of the hood portion of the mating housing abuts against the protective wall by fitting the fitting protrusion of the housing main body to the hood portion of the mating housing, characterized in that the protective wall is integrally provided at the base of the elastic arm portion, and is formed in the strut portion in a range of the elastic arm portion which does not reach the bent portion. the housing has a housing main body including a fitting protrusion fitted to a tubular hood portion of the mating housing; a sealing member mounted to the fitting protrusion of the housing main body and configured to seal between the fitting protrusion and the fitted hood portion of the mating housing; and the housing has a lock arm including a cantilever-shaped elastic arm portion that extends from an outer peripheral surface of the housing main body to a fitting side with the mating housing and has a locking portion configured to be engaged with and/or disengaged from a locking protrusion formed on the mating housing, wherein a protective wall is formed on an outer surface of the housing main body, and wherein the protective wall is provided over a width direction of the housing main body at a position in the housing main body facing a gap between the hood portion and the housing main body when the fitting protrusion of the housing main body is fitted to the hood portion, the elastic arm portion includes a strut portion formed above the housing main body and connected to the housing main body, a bent portion bent from the strut portion toward the fitting side with the mating housing, and an extending portion extending from the bent portion toward the fitting side of the mating housing, and wherein in the housing, an edge portion of the housing main body on the fitting protrusion side is a fitting edge portion having a larger outer shape than a seal mounting portion, the protective wall is formed at the fitting edge portion of the housing main body on the fitting side with the mating housing, and is formed along the width direction of the housing main body, and wherein a tip end of the hood portion of the mating housing abuts against the protective wall by fitting the fitting protrusion of the housing main body to the hood portion of the mating housing, characterized in that the protective wall is integrally provided at the base of the elastic arm portion, and is formed in the strut portion in a range of the elastic arm portion which does not reach the bent portion.