PROBLEM TO BE SOLVED: To provide a body fat accumulation inhibitor having a high reducing effect on body fat accumulation by improving an immune function, and to provide food and drink containing the same.SOLUTION: There are provided the body fat accumulation inhibitor having killed bacteria of lactobacillus as an active ingredient, and the food and drink containing the body fat accumulation inhibitor.【課題】免疫機能を改善することによって高い体脂肪蓄積減少効果を有する体脂肪蓄積抑制剤およびそれを含有する飲食品を提供する。【解決手段】乳酸菌の死菌を有効成分とする体脂肪蓄積抑制剤および当該体脂肪蓄積抑制剤を含有する飲食品。【選択図】なし