Patent ID: 6974272

Claim:
A writing instrument cap having a clip as a separate part, characterized in that a clip attachment to which the clip is fitted is projectively formed on the outer periphery of the writing instrument cap, the clip attachment is formed with a vent hole penetrating between the interior and exterior of the writing instrument cap and raised portions for attachment of the clip, the raised portions being provided on both sides of the vent hole with respect to the circumference of the writing instrument cap; in the state where the clip is attached to the clip attachment, the clip covers the clip attachment and the vent hole and creates a clearance between a clip interior and the clip attachment so as to establish an air passage that communicates between the vent hole and the outside atmosphere; an inner cap is provided in the interior of the writing instrument cap for sealing a vicinity of a point assembly of a writing instrument body; and, an air channel that communicates between spaces being separated by the inner cap, or a front end side space and a writing instrument body side space, inside the writing instrument cap, is formed around an outer periphery of the inner cap.