A compound represented by the following general formula (I): (I) (wherein R1 represents optionally substituted phenyl, etc.; R2 represents C1-8 alkyl, etc.; A represents oxygen, etc.; X represents a C1-8 alkylene chain, etc.; Y represents C(=O), etc.; R3, R4, and R5 each represents hydrogen, C1-8 alkyl, etc.; B represents CH, etc.; Z represents oxygen or sulfur; R6 and R7 each represents hydrogen, etc.; and R8 represents hydrogen, etc.; provided that at least one of R3, R4, and R5 is not hydrogen) or a salt of the compound; and a PPAR-δ activator which contains the compound or salt as the active ingredient.