The present invention provides a tumor cell-soluble TNF family member molecule complex containing a tumor cell and an isolated soluble TNF family member molecule, wherein the soluble TNF family member molecule is bound on a surface of the tumor cell such that it binds to a receptor of the TNF family member expressed on a surface of a cell other than the tumor cell, and stimulates the cell other than the tumor cell via the receptor, and a composition and a tumor vaccine, each containing the complex.
