To provide a mounting device of a hose bracket that prevents the displacement of the hose bracket, does not interfere with an extended bracket or a spring seat, and does not require joining by welding.

The cylindrical extended bracket 3 is vertically movably fitted to the outer periphery of a base end of an outer shell 1 to form a length adjustable hydraulic buffer A, and the mounting device of the hose bracket mounts the hose bracket 8 for attaching a hose to the hydraulic buffer A. Positioning holes 20 and 21 are formed toward the radial direction on a cylinder body 3a of the extended bracket 3, a cylinder 4 is fitted to the outer periphery of the cylinder body 3a of the extended bracket 3, a notch piece 23 is formed in the end of the cylinder 4, the notch piece 23 is bent, caulked, and engaged with the holes 20 and 21, and a base end of the hose bracket 8 is fixed to the outer surface of the cylinder 4.