To provide pressure cylinder equipment using water or gas as a pressure transmission medium and capable of forming a lubrication film having sufficient thickness continuously by supplying the lubrication film onto a slide-contact face of seal packing to prevent wear of the seal packing securely.

In this pressure cylinder equipment having a cylinder and a piston provided slidably inside the cylinder, provided with the seal packing on an outer peripheral face, and supplying water or gas into a pressure chamber prescribed by the cylinder and the piston or discharging water or gas from the pressure chamber to change internal pressure in the pressure chamber and let the piston slide, lubricating grease held on a piston side are supplied onto the slide-contact face of the seal packing by utilizing changes of internal pressure.