A front fork of a two-wheeled vehicle or the like is disclosed in which an annular free valve is provided between a taper-like valve seat surface formed in an upper surface of a valve seat member fixed to an inner periphery of a lower end portion of an inner tube and a valve stopper so as to be movable upward and downward such that an annular gap is formed with respect to an outer periphery of a hollow pipe. A leaf spring energizing the free valve to the taper-like valve seat surface is provided in an upper side of the free valve, the leaf spring having an annular portion and a plurality of hook portions extending in a radial direction to an inner periphery of the annular portion, and being formed in a flat shape in a free state.