An ionic liquid can disperse graphene at a high concentration. The ionic liquid can be represented by general formula (1): in which R1 and R5 may be the same or different and each independently represents a substituted or unsubstituted C1-7 linear or branched alkyl group; R2 is represented by formula (2): in which R6 and R7 may be the same or different and each independently represents a C1-4 linear or branched alkylene group, and m represents an integer of 1-5; R3 and R4 may be the same or different and each independently represent a hydrogen atom, substituted or unsubstituted C1-4 linear or branched alkyl group; X− represents a counter ion; and n represents 0-30.