| 摘要 |
A writing instrument 1 includes: a writing instrument body and an ink cartridge 6 connected to a rear end side of the writing instrument body. The ink cartridge 6 includes a bottomed cylindrical container 7 with an opened front end and a plug 8 fitted into an inner circumferential surface of an opening 72 of the container 7. The writing instrument body includes a projection 53 that opens the ink cartridge 6 when inserted into the opening 72 to press the plug 8 rearward and an air tight connecting portion 52, formed separately from the projection 53, that surrounds the projection 53. The opening 72 is divided into a plurality of openings by air tight fitting the opening 72 in the air tight connecting portion 52. Thus, a plurality of longitudinal channels are formed on an outer periphery of the projection 53. At least one of the plurality of channels serves as an ink channel and at least one of the other channels serves as an air intake path. |
