An ink jet ink composition, comprising: water; and particles comprising a polymer having an anionic group, a photo-acid generator, and a sensitizer, wherein a number of millimoles of the anionic group per 1 g of the particles is defined as an intra-particle anion value A, a number of millimoles of the photo-acid generator per 1 g of the particles is defined as an intra-particle photo-acid generator amount G, and a value obtained by subtracting the intra-particle photo-acid generator amount G from the intra-particle anion value A is -0.20 or more and 0.20 or less, the sensitizer is at least one selected from the group consisting of a compound represented by the following Formula, a compound represented by the following Formula, and a compound represented by the following Formula: wherein, in Formula, Formula, and Formula, R 11, R 12, R 21, R 33, and R 34 each independently represent a halogen atom, an alkyl group, an aryl group, a hydroxy group, an amino group, an alkylsulfanyl group, an alkylamino group, an alkoxy group, an alkoxycarbonyl group, an acyloxy group, an acyl group, a carboxy group, or a sulfo group; n11, n12, n21, n33, and n34 each independently represent an integer of 0 to 4; when n11 is an integer of 2 to 4, a plurality of R 11 may be the same or different; when n12 is an integer of 2 to 4, a plurality of R 12 may be the same or different; when n21 is an integer of 2 to 4, a plurality of R 21 may be the same or different; when n33 is an integer of 2 to 4, a plurality of R 33 may be the same or different; when n34 is an integer of 2 to 4, a plurality of R 34 may be the same or different; R 22 and R 23 in Formula each independently represent a hydrogen atom, a halogen atom, an alkyl group, or a hydroxy group; and R 31 and R 32 in Formula each independently represent an alkyl group. water; and particles comprising a polymer having an anionic group, a photo-acid generator, and a sensitizer, wherein a number of millimoles of the anionic group per 1 g of the particles is defined as an intra-particle anion value A, a number of millimoles of the photo-acid generator per 1 g of the particles is defined as an intra-particle photo-acid generator amount G, and a value obtained by subtracting the intra-particle photo-acid generator amount G from the intra-particle anion value A is -0.20 or more and 0.20 or less, the sensitizer is at least one selected from the group consisting of a compound represented by the following Formula, a compound represented by the following Formula, and a compound represented by the following Formula: wherein, in Formula, Formula, and Formula, R 11, R 12, R 21, R 33, and R 34 each independently represent a halogen atom, an alkyl group, an aryl group, a hydroxy group, an amino group, an alkylsulfanyl group, an alkylamino group, an alkoxy group, an alkoxycarbonyl group, an acyloxy group, an acyl group, a carboxy group, or a sulfo group; n11, n12, n21, n33, and n34 each independently represent an integer of 0 to 4; when n11 is an integer of 2 to 4, a plurality of R 11 may be the same or different; when n12 is an integer of 2 to 4, a plurality of R 12 may be the same or different; when n21 is an integer of 2 to 4, a plurality of R 21 may be the same or different; when n33 is an integer of 2 to 4, a plurality of R 33 may be the same or different; when n34 is an integer of 2 to 4, a plurality of R 34 may be the same or different; R 22 and R 23 in Formula each independently represent a hydrogen atom, a halogen atom, an alkyl group, or a hydroxy group; and R 31 and R 32 in Formula each independently represent an alkyl group.