There is provided a stent for biliary discharge and biliary cancer biopsy that can conveniently perform a biopsy of biliary tract cancer. In this stent, a zigzag-shaped groove is formed on the outer wall of the insertion tube made of synthetic resin, and the groove is a bottom portion, a first side wall connecting one side of the bottom portion and the outer wall, and a second side wall connecting the other side of the bottom portion and the outer wall. Includes side walls. The first corner composed of the first side wall and the outer wall collects the bile duct epithelial tissue when the stent is inserted into the bile duct, and the second corner composed of the second side wall and the outer wall stores the bile duct epithelial tissue collected when the stent is withdrawn from the bile duct. do. Further, at the bottom, an artificial polymer used as an extracellular matrix for three-dimensional cell culture of the collected bile duct epithelial tissue, and a cell growth inducing agent for inducing cell growth are formed.
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