In an energy treatment unit and an energy treatment instrument, a jaw openable and closable relative to a probe distal portion of a probe is attached to a distal portion of an energy transmission portion. A liquid feed conduit extends between the energy transmission portion and the probe in a cavity portion, and a liquid ejected from an ejection port, that is formed at a distal end of the liquid feed conduit, flows into a jaw cavity in an inside of the jaw. A liquid outflow portion is provided on an outer surface of the jaw, and the liquid flowing into the jaw cavity flows to an outside of the jaw from the liquid outflow portion.
