To provide a hook for hanging on a pole developing strong fastening force for cramping a pole or the like with big force.

The hook for hanging on a pole has a hook part 11 which extends from a lower side toward an upper side of the pole or the like 10 and turns around at the upper side and again extends toward the lower side so as to generally surround the pole or the like 10, and at least three projection parts 15, etc., provided inside the hook part 11 so as to contact with an outer periphery face of the pole or the like 10 for catching the pole or the like 10. Each of the projection parts 15 has a supporting part 16 which is linearly contacted with the outer periphery surface of the pole or the like 10 and is parallel with an axial direction of the pole or the like 10.