In a waterproof connector housing in which a hood portion for fitting with a counter housing is projected from a housing body portion, an elastic seal ring which maintains watertightness with the counter housing is disposed inside the hood portion, and a retaining piece of the elastic seal ring is engaged with the hood portion, a fitting convex portion is projected integrally from an inner face of the hood portion on a contact face in which the hood inner face is contacted with the seal ring, and the elastic seal ring is integrally formed in a state where the fitting convex portion bites the seal ring.