To make right and left knuckle brackets common, reduce press molds and man-hours of management, and simplify management of stocks.

In this knuckle bracket 20 of an oil hydraulic buffer 10, when seen from a side view under a condition that an axial direction of the knuckle bracket 20 is disposed in an upward and downward direction, the knuckle bracket 20 is shaped symmetrically in the upward and downward direction. A brake hose bracket 30 is installed at an upward and downward center of the knuckle bracket 20, and the brake hose bracket 30 is also shaped symmetrically in the upward and downward direction.