Mechanical pencil

摘要

A writing instrument includes a holding outer tube to be held by the user and a lead rod holding means, said lead rod holding means being provided in said holding outer tube and movable relative to said outer tube. The writing instrument has a lead rod feeding means; an engaging member for holding said lead rod holding mechanism at a position where a lead rod guiding pipe engages with an engaging surface formed on said holding outer tube when said lead rod guiding pipe advances to a position projected from said holding outer tube by pressing said lead rod holding means; and a push button provided for pushing said engaging member to release the engagement with said surface.