PURPOSE: To cause a content to be easily discharged by a weak pressing force, and at the same time, enhance the content volume and airtightness of a writing tool without changing the holding position of the writing tool, in a writing tool such as a marking pen.

CONSTITUTION: A correction pen 2 is composed mainly of a main correction pen system 4 containing a correction fluid, a compression plastic ring 6a and a tip 6b mounted on the tip part and a leading axle 8 engaged inside the base of the main correction pen system 4. The main correction pen system 4 is formed thinly within a specified range at least, from the base in an axial direction. At the same time, a leading axle 8 has the rear end part extending backward along the inner peripheral face of a thin wall part 4a. Further, an almost cylindrical void 10 is formed between the counter faces of an extension part 8a and the thin wall part 4a.