The shear-sensitive aqueous ballpoint pen ink composition of the present invention comprises 1 to 35% by weight of a colorant, 2 to 35% by weight of a water-soluble polar solvent, and 1 to 30% by weight of a nonionic surfactant having an HLB value in the range of 8 to 12. And a remainder consisting of water and an additive for adjustment, having a viscosity of 25 mPa · s to 160 mPa · s (value at 25 ° C., rotation speed of 100 rpm in an EM type rotational viscometer) and shear loss in the range of 0.1 to 0.6 Having an index of sex, the nonionic surfactant has a mixed phase comprising a phase dispersed in particulate form and a phase dissolved in a molecular state.;In addition, the present invention discloses a method for producing an ink composition and a ballpoint pen using the ink composition.
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