PROBLEM TO BE SOLVED : To provide a novel tyrosinase activity promoter and a method of using the same. SOLUTION : The tyrosinase activity promoter contains a compound having the following general formula (I) as an active ingredient. (In the formula, R1 is OR2 or NR3R4; R2 is hydrogen or a C1-3 alkyl group; R3 and R4 are each independently selected from hydrogen and a C1-3 alkyl group, or R3 and R4 together form, with N linked thereto as a heteroatom, a 4-, 5- or 6-membered azacycloalkyl group.) SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT