Disclosed are a novel therapeutic agent and a novel treatment method for cancer.Specifically disclosed are: a targeting agent for a cell selected from the groupconsisting of a cancer cell and a cancer-associated fibroblast, which comprisesa retinoid; a substance delivery carrier for the cell, which comprises the targetingagent; an anti-cancer composition utilizing the targeting agent or the carrier;an anti cancer-associated fibroblast composition; and a method for treatmentof cancer.