| 摘要 |
An end plug mounting structure for writing instrument of the present invention can securely mount an end plug onto a barrel and remove it more easily. Even if assembling and removing is performed repeatedly, tightness for the end plug to be assembled on the barrel can be prevented from weakening. A locking hole is provided around cylindrical rear portion of the barrel, an inserting portion with circular cross section inserted into rear portion of the barrel from rear end of the barrel is provided on the end plug, a locking protrusion locked in a locking hole is provided at periphery of the inserting portion, a groove extending forward from rear end of the barrel and in which the locking protrusion moves is provided on inner surface of rear portion of the barrel, thereby the end plug is assembled on the barrel by means of locking the locking protrusion that moves forward in the groove in the locking hole. The locking hole is configured to be adjacent to the groove, so that the locking protrusion moving forward in the groove moves in circumferential direction so as to be locked in the locking hole. A protruding strip extending in lengthwise direction is configured on side bottom of the groove on the side of the locking hole, so that the locking protrusion can stride over the protruding strip to move along circumferential direction.
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