To provide a writing instrument capable of preventing dryness in the evaporation or pen core of the ink. The apparatus includes a pen housing and the ink holder 30, is opening and closing lid 41 is a sealing member 40 pen core 31 is infested, a spring 50, ink holder is front and backward in the state of accommodating the sealing member, pen core the guide member 60 movable operation hole is penetrated, is composed of, the lid is guided in a cam groove 67 which leads the straight portion 67a in the guide member and on the inclined portion 67b, upon movement of the sealing member, the lid The closing and guides, a locking portion 61 on the side surface of the guide member, and a moving hole 62 is dug to form a cam protrusion 70 on the print carriage, the sealing member is in close contact with the outer diameter of the print carriage 30 on the inner diameter portion The sealing portion that so by projecting molded inward, and its outside diameter, is formed a projection 44 and is coupled in a state of being accommodated inside the accommodating groove protrusions were formed on the inner side of the pen housing locking cap 45 to be so engaged with the step portion is provided. .BACKGROUND 9
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