To provide a connector responding to the injection of nutrient of various properties, facilitating the management by a caretaker, and being manufactured at a low cost in a single connector.

This connector consists of a U-shaped connecting member having a connection tube body, a first connecting section that is provided at the proximal side of the connection tube body and connected to a fluid supply tube, a second connecting section that is provided at the distal side of the connection tube body and connected to a nutrient pathway of the fistula catheter, a third connecting section detachably connected to the second connecting section, and a fourth connecting section that is provided orthogonally to the axial direction of the third connecting section and connected to the nutrient pathway of the fistula catheter.