A piezoelectric element includes: a piezoelectric body and a vibrating plate including single crystal silicon having anisotropy having orientation with a relatively high Poissons ratio and orientation with a relatively low Poissons ratio (hereinafter, referred to as “low Poissons ratio orientation”) as a vibrating material, in which the piezoelectric body and the vibrating plate are laminated on each other so that the low Poissons ratio orientation is in a direction along a high expansion and contraction direction among a direction where a degree of expansion and contraction caused according to a support structure of the piezoelectric body is relatively high (hereinafter, referred to as “high expansion and contraction direction”) and a direction where a degree thereof is relatively low.
