A waterproof connector includes elastic material, seal portion formed on a female connector housing by double molding in such a manner that the seal portion closes openings through which wires are guided, respectively, and covers a flange formed on an outer periphery of the female connector housing. The seal portion has a watertight surface at its front side. A male connector housing has hood portions for receiving the female connector housing. The hood portion includes a front end having an abutment surface for abutment against the watertight surface. With this construction, as the male and female connector housings engaged, metal terminals are fittingly connected together, and each abutment surface is brought into contact with an associated watertight surface, thereby sealing a gap between the two connector housings.