An agent for the treatment of allergic eye disease containing a 3-anilino-2-cycloalkenone derivative having the formula (I): wherein R1 is an unsubstituted or substituted C1 to C8 alkyl group provided that an unsubstituted methyl group is excluded, a C3 to C7 cycloalkyl group, a C6 to C10 bicycloalkyl group or an indanyl group, etc., R2 is a C1 to C4 alkyl group, R3 is a hydrogen atom, a C1 to C5 alkyl group, a C3 to C7 cycloalkyl group, etc., R4 is a hydrogen atom, an unsubstituted or substituted C1 to C5 alkyl group, a halogen atom, etc., R5, R6, R7 and R8 are independently a hydrogen atom, a C1 to C5 alkyl group, etc., X is —(CR11R12)n— or NR13—, wherein n is 0 to 2, R11, R12 and R13 are independently a hydrogen atom, a C1 to C5 alkyl group, etc.