The subject innovation relates to a writing instrument, of an additional function by using the ring pieces to be used as the touch member for the touch of the screen when using a terminal, such as with all PDA can expect a decorative effect by hanging the like necklaces and accessories when securing the variety and, in the ring side coupled to the protection cap and a state where the ring side hanging a necklace and accessories such as the ring piece to ensure that has a free state in the circumferential direction talk to the convenience and decorative effect of the cell because of the flow of the writing instrument One would prevent the negative part of the month, including the necklace and trinket twisted.; Designed present to achieve this, the body (1) having a space therein, only the needle portion of the text is written in a state fitted to the inside of the main body (1) writing seam is exposed to the outside (2) and said body (1 ) of the writing body (2) are coupled detachably to the outer exposed portion is composed of a protection cap 3 for protection handwriting shims, the protective cap has been a through-hole 8 is formed in a state given so as to communicate the inside and outside, the protection the cap 3 is provided with hooks to achieve a is overall V-shaped end of the portion to be fitted into the through hole (8) of the according to the provided ring pieces 9 with fitted state through a through hole (8), wherein the ring pieces 9 10 is formed in the ring piece (9) is in the fitted state with the through hole 9 of the protective cap (3) without not get out in the axial direction due to the engagement of the hook (10) circumferentially is free to rotate and so, the main body (1) of the protective cap, the opposite ends of the (3) a combination that However, this as close to the sharp state body (1) and the more slender form of the touch screen part 11 in a direction away is provided characterized in that to select a key on the terminal such as a PDA by using the touch screen part one will.
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