An electric wire includes a conductive core wire and an insulative sheath covering the core wire. An elastic waterproof plug is fit with the electric wire such that a first longitudinal end portion thereof is fit with the core wire, and a second longitudinal end portion thereof is fit with the sheath. A conductive terminal is electrically connected with the electric wire, and inserted into a terminal insertion hole formed in the waterproof connector housing together with the waterproof plug to seal the terminal insertion hole. The terminal includes a first clamping member which clamps over the first end portion of the waterproof plug, and a second clamping member which clamps over a part of the core wire exposed from the first end portion of the waterproof plug.