PURPOSE: To obtain the title composition capable of preventing abrasion of a ball seat provided at the tip of a ball-point pen and being discharged smoothly and having excellent initial writing properties and writing quality, by incorporating fluoro surface active agent and a water-soluble resin in an ink composition contg. a pigment and an aqueous solvent.

CONSTITUTION: An ink composition contg. 2W30wt% pigment and 5W40wt% water-soluble polyhydric contg. 2W30wt% pigment and 5W40wt% water-soluble polhydric alcohol (e.g.: ethylene glycol) is incorporated with 0.01W0.5wt% fluoro surface active agent (e.g.: sodium perfluorolauryl sulfate) and 0.5W10.0wt% water-soluble resin (e.g.: water-soluble acrylic resin) and optionally an antiseptic, a mildewproofing agent, an anticorrosive agent, etc.