a clip mounting structure for a writing implement has a shaft tube , a clip mounted at the rear part of the shaft tube , and an insertion member inserted into the rear part of the shaft tube . a clip mounting section to which the rear part of the clip is fitted and aligned is formed at the rear part of the shaft tube . mounting sections curved in the direction along the inner peripheral surface of the shaft tube are formed at opposite sides of the rear part of the clip . fitting recesses into which the mounting sections of the clip are fitted are formed in the outer wall of the insertion member . with the mounting sections of the clip fitted in and engaged with the fitting recesses in the insertion member , the insertion member is inserted into the rear part of the shaft body to fit the rear part of the clip into the clip mounting section of the shaft tube . thus , the insertion member is engaged in position inside the shaft tube .