A waterproof connector has an inner housing, an outer housing, and a rubber plug. The inner housing has a terminal accommodation chamber, a terminal that is accommodated within the terminal accommodation chamber being connected to an electric wire. The outer housing has an opening and a bottom wall. When the inner housing is inserted from the opening into the outer housing and the both are fitted together, the bottom wall opposes the terminal accommodation chamber. The outer housing has a hole that is formed in the bottom wall and that opens toward outside the outer housing, and a concavity portion that communicates the hole and the interior of the outer housing. The rubber plug has a main-body portion corresponding to the concavity portion, a cylindrical extended portion corresponding to the hole, and a through hole passing through the main-body portion and the extended portion. The main-body portion is inserted into the concavity portion while the extended portion is inserted into the hole. The through hole communicates the interior of the outer housing and the exterior of the same. The electric wire passes through the through hole and is then extended into the outer housing and connected to the terminal.