A curable composition comprising: one or more kinds of polyfunctional compounds selected from the group consisting of a compound represented by Formula, a compound represented by Formula, and a compound represented by Formula; and one or more kinds of compounds selected from the group consisting of a compound represented by Formula and a betaine monomer, in Formula, R 1 to R 4 each independently represent a hydrogen atom or an alkyl group, L 1 and L 2 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, in Formula, R 5 to R 8 each independently represent a hydrogen atom or an alkyl group, L 3 represents a single bond or an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A - and -CO-, L 4 and L 5 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, G represents a trivalent linking group, in Formula, R 9 to R 12 each independently represent a hydrogen atom or an alkyl group, L 6 to L 8 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, n represents an integer of 0 to 3, L 7 s may be the same as or different from each other in a case where there is a plurality of L 7 s, R 11 s may be the same as or different from each other in a case where there is a plurality of R 11 s, in Formula, R 20 represents a hydrogen atom or a methyl group, X represents a p-valent linking group, p represents an integer of 2 to 4, and a plurality of R 20 s may be the same as or different from each other. one or more kinds of polyfunctional compounds selected from the group consisting of a compound represented by Formula, a compound represented by Formula, and a compound represented by Formula; and one or more kinds of compounds selected from the group consisting of a compound represented by Formula and a betaine monomer, in Formula, R 1 to R 4 each independently represent a hydrogen atom or an alkyl group, L 1 and L 2 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, in Formula, R 5 to R 8 each independently represent a hydrogen atom or an alkyl group, L 3 represents a single bond or an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A - and -CO-, L 4 and L 5 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, G represents a trivalent linking group, in Formula, R 9 to R 12 each independently represent a hydrogen atom or an alkyl group, L 6 to L 8 each independently represent an alkylene group which may contain one or more kinds of divalent linking groups selected from the group consisting of -O-, -S-, -NR A -, and -CO-, R A represents a hydrogen atom or an alkyl group, n represents an integer of 0 to 3, L 7 s may be the same as or different from each other in a case where there is a plurality of L 7 s, R 11 s may be the same as or different from each other in a case where there is a plurality of R 11 s, in Formula, R 20 represents a hydrogen atom or a methyl group, X represents a p-valent linking group, p represents an integer of 2 to 4, and a plurality of R 20 s may be the same as or different from each other.