Waterproof plug for connector, waterproof connector comprising the same and method of attaching the same

A waterproof plug for a connector, comprising:

• an elastically deformable seal member for sealing a housing which houses terminals fixed at edges of electric cables in the inside thereof;
• wherein the seal member is housed inside the housing by press-fitting, and has at least two elements holding the electric cables by sandwiching from both sides and tightly contacting with outer peripheral surfaces thereof, and
• wherein the at least two elements have first sealing surfaces fitting to an inner surface of the housing, second sealing surfaces fitting to the outer peripheral surfaces of the electric cable and third sealing surfaces connecting to the second sealing surfaces, and the second sealing surfaces of the at least two elements being formed of continuous inner peripheral surfaces having a curvature substantially the same as that of the outer peripheral surfaces of the electric cables.