A waterproof connector includes an inner housing, an outer housing, a rubber plug and a spacer. The inner housing includes a plurality of terminal accommodation chambers, and a terminal is accommodated in each of the terminal accommodation chambers. The inner housing is fitted into the outer housing. The outer housing includes a first wall. The first wall includes a rubber plug accommodation recess which opens inside the outer housing, and a first insertion hold bringing the rubber plug accommodation recess and the outside into communication with each other. The rubber plug includes a third insertion hole, and is inserted in the rubber plug accommodation recess. The spacer is disposed between the inner housing and the outer housing for holding the terminals accommodated in the terminal accommodation chamber. The spacer includes a second wall between the terminal accommodation chamber and the first wall. The second wall includes a second insertion hole. The terminals in the terminal accommodation chambers are connected to electric wires. Each of the electric wires passes through the first, third and second insertion holes. The terminal accommodation chambers and the electric wires are sealed by the rubber plug.