| 摘要 |
A writing instrument has a felt pen core held in a leading holder at the leading end of a pen shaft. The pen core is movable along the longitudinal direction of the pen shaft and is pressed in the longitudinal direction to supply ink stored in an ink storage chamber inside the pen shaft to the pen core. A base end portion includes a projection with a tapered outer side surface that narrows the projection in the tail direction. The projection is lower than an engaging portion and is movable along the longitudinal direction between the engaging portion and the leading end of the pen shaft. A notch is formed in a base-end surface of the base end portion and extends in the upper direction. The projection undergoes an elastic deformation to narrow the width of the notch, thereby narrowing a maximum width of the projection.
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