An FGF21 production promoting agent containing, as an active ingredient, a compound represented by the following formula (1): wherein each of R 1 and R 2 , which may be identical to or different from each other, represents, for example, a hydrogen atom； each of R 3a , R 3b , R 4a , and R 4b , which may be identical to or different from one another, represents, for example, a hydrogen atom or a halogen atom, or R 3a and R 3b or R 4a and R 4b may bond together to form an alkylenedioxy group； X represents an oxygen atom, a sulfur atom, or N-R 5 (R 5 represents, for example, a hydrogen atom or a C 1-4 alkyl group)； Y represents, for example, an oxygen atom, an S(O), group (1 is a number of from 0 to 2), or a carbonyl group； Z represents CH or N； n is a number of from 1 to 6； and m is a number from 2 to 6, a salt of the compound, or a solvate of the compound or the salt.
