An FGF21 production promoting agent containing, as an active ingredient, a compound represented by the following formula (1):wherein each of R1 and R2, which may be identical to or different from each other, represents, for example, a hydrogen atom； each of R3a, R3b, R4a, and R4b, which may be identical to or different from one another, represents, for example, a hydrogen atom or a halogen atom, or R3a and R3b or R4a and R4b may bond together to form an alkylenedioxy group； X represents an oxygen atom, a sulfur atom, or N—R5 (R5 represents, for example, a hydrogen atom or a C1-4 alkyl group)； Y represents, for example, an oxygen atom, an S(O)l group (l 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.
