PROBLEM TO BE SOLVED: To provide a pharmaceutical composition for inhibiting or preventing tumor metastasis.SOLUTION: The present invention provides a pharmaceutical composition for inhibiting or preventing tumor metastasis, containing B220-positive, CD11c-positive and NK1.1-positive cells.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】腫瘍の転移を抑制又は予防するための医薬組成物の提供。【解決手段】B220陽性、CD11c陽性且つNK1.1陽性の細胞を含む、腫瘍の転移を抑制又は予防するための医薬組成物。【選択図】図5