Disclosed are an anti-tumor agent, beverages and foods using the same and a process for manufacturing the anti-tumor agent. The anti-tumor agent according to the present invention exhibits specific effects on human tumor cells A4573 and mouse melanoma B16 cells in vitro. The anti-tumor agent exhibits various immune activities in addition to immune activity against tumors. Beverages and foods containing said anti-tumor agent can be manufactured as health food or the like.