| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball-point pen preventing a rod part from being bent at an intermediate part in an axial direction of a tip body and obtaining reliable sealability between a ball and a front end edge part.SOLUTION: A deformation prevention part 7 comprising a plurality of inward protrusions formed by inward pressing deformation and preventing bending deformation of a rod part 81 is provided on an intermediate part internal surface in an axial direction of a tip body 2. An ink outflow gap 71A extending radially from a central part outward in a radial direction is formed between the inward protrusions for the deformation prevention part 7. The rod part 81 is loosely inserted into the ink outflow gap 71A between the inward protrusions for the deformation prevention part 7. Inclined recesses 7Aa, 7Ba are formed at a central part of a rear side surface of each of the inward protrusions for the deformation prevention part 7. The recesses 7Aa, 7Ba are smoother than a rear side surface of each of the inward protrusions for the deformation prevention part 7 other than the inclined recesses 7Aa, 7Ba. |
