PROBLEM TO BE SOLVED: To provide a solid writing tool good in discoloration property of handwriting and excellent in temporal stability after discoloration.SOLUTION: There is provided a solid writing tool containing (1) a reversible thermochromic microcapsule pigment including a reversible thermochromic composition containing (a) a component consisting an electron giving coloration organic compound, (b) a component consisting of an electron receiving compound and (c) a reaction medium reversibly originating an electron giving and receiving reaction by the (a) component and the (b) component in a specific temperature region, (2) an excipient and (3) a filler and having a flexure strength measured according to JIS S6005 of the solid writing tool of 10 MPa or more and printed amount measured according to JIS S6005 of 1.0 mg/m or more.
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