The liquid jet head is provided with a piezoelectric substrate having a plurality of groove rows in each of which elongated ejection grooves and elongated non-ejection grooves are alternately arranged in a reference direction. The groove rows are arranged next to one another in the longitudinal direction of the grooves, and in adjacent ones of the groove rows, the right ends of ejection grooves included in a groove row located on a left side and the left ends of non-ejection grooves included in a groove row located on the right side are separated from each other, and overlap each other in a thickness direction of the piezoelectric substrate.