The present invention provides an anti-obesity agent having an anti-obesity effect obtained by combining a few extracts, which is attained by an anti-obesity agent (FC) containing Forsythia leaf extract and Citrus extract, and, in addition to these extracts, the anti-obesity agent containing Forsythia leaf extract, Citrus extract, and one extract selected from the group consisting of Licorice extract (FCGr) and Gardenia fruit extract (FCGf). These anti-obesity agents exhibited an ideal anti-obesity effect of decreasing white adipocytes while maintaining a basal metabolic rate without having a significant effect on brown adipocytes.