| 摘要 |
[Problem to be Solved] Provided is a writing instrument, in which stable writing performance can be maintained for a long term, and a feeling of writing and handwriting are favorable. [Solution] A writing instrument including: a pen point retaining member; a pen point that is attached to a first end of the pen point retaining member; an ink tank that is attached to a second end of the pen point retaining member; and an ink for a writing instrument that is accommodated in the ink tank. The ink includes a lubricating interface layer-forming compound, and a carbonaceous film is formed on at least one of a surface of the ball or a contact portion of the ball holding portion with the ball. |
