The liquid jet head (1) includes: a piezoelectric substrate (4) including a plurality of grooves (5) which are formed therein from a front end (FE) to a rear end (RE) of a surface of the substrate and separated from one another by side walls (3), the piezoelectric substrate having lead-out electrodes (8) formed on top surfaces of the side walls (3); a cover plate (11) which includes a manifold (9) and is bonded to the surface of the piezoelectric substrate (4); and a sealing material (14) for blocking, of channels formed by the cover plate (11) and the grooves (5), openings of rear channels (10) formed on the rear end (RE) side with respect to the manifold (9).