Patent ID: 8484808

Claim:
A clip attachment structure for a writing instrument comprising: a shaft tube; a clip having a clip piece, a base formed at a back end of the clip piece, and attachment pieces curving in a direction along an inner circumferential surface of the shaft tube, and an insertion member adapted to be inserted in a back part of the shaft tube for attaching the clip with respect to the back part of the shaft tube; fitting recesses formed on an outer wall of the insertion member; necks provided on both sides of the base of the clip; the attachment pieces being continuously formed at tips of the necks and adapted to be fitted and engaged in the fitting recesses; and slits formed in an axially parallel fashion in the back part of the shaft tube, so that the insertion member which has the clip with the attachment pieces being fitted and engaged in the recesses can be inserted into the back part of the shaft tube while causing the necks to be fitted into the slits, whereby the clip is securely attached with respect to the back part of the shaft tube, wherein one of an inner wall of the shaft tube and an outer wall of the insertion member has an engaging stopper portion, and the other of the inner wall of the shaft tube and the outer wall of the insertion member has an engaging protrusion, the engaging protrusion being adapted to be abutted against the engaging stopper portion when the insertion member is inserted in the back part of the shaft tube, whereby the engaging stopper portion and the engaging protrusion collectively function as a means for engaging the insertion member within the shaft tube.