A fistula catheter which allows a supply tube to be easily connected to a body-external fixing member positioned on the body surface side, and which is only slightly invasive for a patient is provided. The fistula catheter 10 includes a tube body 11 which is inserted into a fistula formed in the abdominal wall and the wall of the alimentary canal; a body-external fixing part 12 which is linked to one end of the tube body 11 and positioned on the abdominal wall surface side of the fistula; and a body-internal fixing part 13 which is linked to the other end of the tube body 11 and positioned inside the wall of the alimentary canal. The body-internal fixing part 13, and the fistula catheter has a flow path allowing fluid to flow through the body-external and body-internal fixing members. The body-external fixing part 12 includes a flexible tube 1 and is connected substantially at right-angles to the axial direction of the tube body 11.