Provided are a piezoelectric element and a liquid-jet head using the same,
in which favorable crystallinity can be obtained with improved
uniformity, breakage of a piezoelectric film can be prevented, thereby
providing stable displacement properties. The piezoeletric element
includes a lower electrode, a piezoelectric film formed on the lower
electrode, and an upper electrode formed on the piezoelectric film. The
piezoelectric film in turn includes a lower layer portion having column
crystals, and an upper layer portion having column crystals which are
continuous from those in the lower layer portion and having sizes larger
than those in the lower layer portion.