Abstract: An increase in body fat is one of main causes of life-style-related diseases such as hypertension, insulin tolerance and hyperlipemia. A composition for body fat reduction is provided which inhibits body fat from decreasing or decreasing which and which is effective in the treatment and prevention of adult diseases a cause of which is body fat. Also, provided are a medicine and a food each containing the composition. The composition for body fat reduction comprises (A) astaxanthin and (B) at least one of active ingredient, an adsorbent and a solubilizer, a composition comprises (A) Haetmatococcusalga extract containing astaxanthin and (B) at least one of active ingredient, an adsorbent and a solubilizer, and a medicine and food, each containing the composition are provided.