| 摘要 |
<p>The outer surface of an inner cap (3) is fixedly secured to the inner surface of an outer cap (4). In the opened end portion of the inner cap (3), there is formed a rear end shell portion (31) which projects backwardly. On the outer peripheral surface of the rear end shell portion (31), there is provided a ring-shaped outward facing seal portion. In the front end portion of a barrel (6), there is formed a front end shell portion (61), projecting forwardly. In the inner peripheral surface of the front end shell portion (61), there is formed a ring-shaped inward facing seal portion. When a cap (2) is mounted on the pen tip (8) side of the barrel (6), the outward facing seal portion can be closely contacted with the inward facing seal portion in the radial direction.</p> |
