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Abstract

An oil-based ballpoint pen includes: a ballpoint pen tip at a tip part of an ink storage cylinder, and an oil-based ballpoint pen ink composition stored in the ink storage cylinder, the oil-based ballpoint pen ink composition containing a colorant, an organic solvent having a boiling point of 140° C. or lower, and a resin, wherein the oil-based ballpoint pen ink composition has an ink viscosity of 300 mPa·s or less at 20° C. and a shear rate of 200 sec⁻¹, an ink consumption of the oil-based ballpoint pen per a writing distance of 100 m is 80 mg or more, and a ratio of a ball diameter B (mm) to an ink consumption A (mg) per a writing distance of 100 m satisfies 100

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