| 摘要 |
Provided is an exceptionally convenient writing instrument which, despite using a replaceable ink cartridge having a stopper body opened by pressing, can minimize the inadvertent leakage of ink prone to occur when the spent cartridge container is withdrawn, thus making cartridge replacement highly easy. The writing instrument is provided with: a replaceable ink cartridge comprising a bottomed cylindrical container which is open at the front end and closed at the back end, and a stopper body which fits against the inside peripheral surface of the opening of the container; and a protruding part which inserts into the opening of the container and presses the stopper body rearward, opening the ink cartridge. When being pressed to open, the protruding part and the stopper body interconnect, and during cartridge replacement, the protruding part and the stopper body disconnect, and the stopper body refastens into the container opening. |
