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1. A valve-timing control apparatus for an internal combustion engine, comprising:
a drive rotating member configured to receive a rotational force from a crankshaft; a driven rotating member fixed to a cam shaft and configured to rotate relative to the drive rotating member; an electric motor configured to rotate the driven rotating member relative to the drive rotating member by means of rotary drive of the electric motor; a housing connected integrally with the drive rotating member, wherein structural components of the electric motor are accommodated in the housing; a cover member fixed to a main body of the internal combustion engine and located to face a front end portion of the housing; a slip ring configured to supply electric power to the electric motor and provided to one of the front end portion of the housing and a facing portion of the cover member which faces the front end portion of the housing; a brush provided to another of the front end portion of the housing and the facing portion of the cover member, and configured to supply electric power to the electric motor by an electrical contact with the slip ring; a tubular motor output shaft provided inside the housing to be rotatable relative to the housing, and configured to be rotated by electric-power supply to the electric motor, wherein lubricating oil is supplied into the tubular motor output shaft; a bearing member provided between an outer circumferential surface of a part of the driven rotating member and an inner circumferential surface of the tubular motor output shaft; a plug member fixed to an inner circumferential surface of a tip portion of the tubular motor output shaft, the cover member facing the tip portion of the tubular motor output shaft, wherein the plug member is configured to inhibit lubricating oil supplied into the tubular motor output shaft from leaking to an external; and a seal member provided between the cover member and the housing and configured to inhibit lubricating oil from entering a gap between the slip ring and the brush, wherein the plug member includes
a core member formed in a bottomed tubular shape having a through-hole in a bottom portion of the core member, andan elastic body coating at least the through-hole and an outer circumferential surface of the core member, the elastic body closing the through-hole.
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