The present invention is a photochromic material formed of a biimidazole compound represented by general formula (1-1): (where, R4 and R5 respectively and independently represent a halogen atom or alkyl group, R1 to R3 and R6 to R8 respectively and independently represent a hydrogen atom, halogen atom, alkyl group, fluoroalkyl group, hydroxyl group, alkoxyl group, amino group, alkylamino group, carbonyl group, alkylcarbonyl group, nitro group, cyano group or aryl group, Ar1 to Ar4 respectively and independently represent a substituted or unsubstituted aryl group, R4 may form a condensed, substituted or unsubstituted aryl ring with R3, and R5 may form a condensed, substituted or unsubstituted aryl ring with R6).