Patent ID: 6966718

Claim:
A writing instrument comprising: a writing instrument body having a refill with a front barrel, and a rear barrel to which the refill is fitted; and a cap as a separate part from the writing instrument body, wherein the refill is comprised of the front barrel and an ink tank, the ink tank is accommodated in the rear barrel and removably fitted to the rear barrel, when the cap is fitted to the writing instrument body, the cap is positioned and fastened to the writing instrument body by abutting an opening end of the cap to a refill attachment side end of the rear barrel, the cap includes: an inner cap disposed inside the cap so as to be movable in the axial direction of the cap by virtue of an elastic element; and a stroke limiter projectively formed from the front end side of the cap interior so as to oppose the inner cap to limit the movement of the inner cap, and the inner cap has a cylindrical front part in which a stopper portion is projectively formed, whereby the movement of the inner cap is restrained by the abutment of the stopper portion and stroke limiter.