A method of manufacturing a liquid jet head includes the steps of: forming
a piezoelectric element on one plane of a passage-forming substrate with
a vibration plate interposed therebetween, and removing the vibration
plate in an area where a communicating portion is formed, thus forming a
penetrated hole; forming a predetermined metal layer on the one plane of
the passage-forming substrate on which the piezoelectric element is
formed to seal the penetrated hole with the metal layer, and patterning
the metal layer in an area corresponding to the piezoelectric element,
thus forming a lead electrode; adhering a reservoir-forming plate, in
which a reservoir portion is formed, to the one plane of the
passage-forming substrate; wet-etching the passage-forming substrate from
the other plane thereof until the vibration plate and the metal layer are
exposed, thus forming a pressure generating chamber and the communicating
portion; and removing the metal layer by etching to allow the reservoir
portion and the communicating portion to communicate with each other.