Taught herein is a charge control agent comprising a specific type of gallic acid metal complex represented by the following Chemical Formula (1) or Chemical Formula (2): In the formula (1), R1 represents an alkyl group containing 1-12 carbon atoms, an Alkenyl group containing 1-12 carbon atoms, a substituted or unsubstituted aryl group containing 6-12 carbon atoms, or a hydrogen atom; R2 and R4 can independently represent an alkyl group containing 1-12 carbon atoms, an Alkenyl group containing 2-12 carbon atoms, an alkoxy group containing 1-12 carbon atoms, a substituted or unsubstituted aryl group containing 6-12 carbon atoms, a halogen atom, or a hydrogen atom; R3 represents an alkyl group containing 1-12 carbon atoms, a substituted or unsubstituted aryl group containing 6-12 carbon atoms, a potassium atom, a sodium atom or a hydrogen atom. M represents a divalent to tetravalent metal atom, A is a counterion, m is a number from 1 to 3, and n is 1 or 2.