THERMOCHROMIC WRITING INSTRUMENT

摘要

PROBLEM TO BE SOLVED: To provide a thermochromic writing instrument containing thermochromic ink, which can easily change the color of thermochromic writing by friction and can be quickly brought into a writing-capable state (pen point projected state) or a stored state (pen point retracted state) even when only one hand is available to use.SOLUTION: A thermochromic writing instrument containing thermochromic ink includes: a writing body 8 accommodating the thermochromic ink therein; a barrel 2 accommodating the writing body 8 therein movably in a longitudinal direction; an operation part 5 for projecting/retracting the pen point 81 of the writing body 8 from the front end hole 31 of the barrel 2; a friction part 4 made of elastic material having low abrasion property and capable of thermally changing writing by frictional heat generated when the writing in the thermochromic ink is rubbed. The friction part 4 is provided on the outer surface of the operation part 5.