In this study, the adipogenesis-suppressing effect of 3,5-dimethoxy(4-methoxyphenyl)benzamide (DMPB), a derivative of the anti-obesity substance resveratrol, was measured in 3T3-L1 cells. The results show that DMPB effectively suppressed the hormone-induced differentiation of 3T3-L1 cells, compared to resveratrol at the same concentration, and reduced the protein expression of fatty acid synthase and acetyl-CoA carboxylase. In addition, DMPB was observed to decrease the PPAR-gamma transcription activity, which was increased by rosiglitazone, in a concentration-dependent manner. From the above results, it is considered that DMPB shows strong potential as an anti-obesity substance.