A modified carbon black comprising carbon black and at least one compound selected from the group consisting of a compound represented by formula and a compound represented by formula, wherein a content of the at least one compound selected from the group consisting of a compound represented by formula and a compound represented by formula relative to 100 parts by weight of carbon black is 0.1 to 50 parts by weight: wherein P 1 and P 2 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or P 1 and P 2 are combined with each other to represent an alkanediyl group having 2 to 6 carbon atoms; m represents an integer of 2 to 9; M n+ represents H + or an n-valent metal cation; and n represents an integer of 1 to 3; wherein R 1 represents an alkanediyl group having 1 to 12 carbon atoms and optionally having a substituent, a cycloalkanediyl group having 3 to 12 carbon atoms and optionally having a substituent, or a * -B 1 -Ar-B 2 - * group wherein * represents a bond, B 1 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, B 2 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and Ar represents a divalent aromatic hydrocarbon group having 6 to 12 carbon atoms and optionally having a substituent; R 2 and R 3 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, a hydroxy group or an alkoxy group having 1 to 6 carbon atoms, or R 2 and R 3 are combined with each other to represent an alkanediyl group having 2 to 12 carbon atoms; R 4 represents a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, an arylalkoxy group having 7 to 15 carbon atoms, an amino group having 0 to 12 carbon atoms or -O - (Y n+) 1/n wherein Y n+ represents an n-valent cation and n represents 1 or 2; and X 2 represents -NH- or -O-. wherein P 1 and P 2 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or P 1 and P 2 are combined with each other to represent an alkanediyl group having 2 to 6 carbon atoms; m represents an integer of 2 to 9; M n+ represents H + or an n-valent metal cation; and n represents an integer of 1 to 3; wherein R 1 represents an alkanediyl group having 1 to 12 carbon atoms and optionally having a substituent, a cycloalkanediyl group having 3 to 12 carbon atoms and optionally having a substituent, or a * -B 1 -Ar-B 2 - * group wherein * represents a bond, B 1 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, B 2 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and Ar represents a divalent aromatic hydrocarbon group having 6 to 12 carbon atoms and optionally having a substituent; R 2 and R 3 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, a hydroxy group or an alkoxy group having 1 to 6 carbon atoms, or R 2 and R 3 are combined with each other to represent an alkanediyl group having 2 to 12 carbon atoms; R 4 represents a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, an arylalkoxy group having 7 to 15 carbon atoms, an amino group having 0 to 12 carbon atoms or -O - (Y n+) 1/n wherein Y n+ represents an n-valent cation and n represents 1 or 2; and X 2 represents -NH- or -O-.