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 containing Forsythia leaf extract, Citrus extract, and at least one extract selected from the group consisting of Licorice extract and Gardenia fruit extract, and it is preferable that the anti-obesity agent contains both Licorice extract and Gardenia fruit extract. The anti-obesity agent exhibits an ideal anti-obesity effect for increasing brown adipocytes and muscle weight to increase a basal metabolic rate and to decrease white adipocytes.