Acoustic wave element, a duplexer and an electronic device and its use

Species acoustic wave element comprising: a piezoelectric body made of lithium niobate having Euler angles (φ, θ, ψ) of the Euler angles satisfy the following relationship: -100 ° ≤θ≤-60 °, -20 ° ≤φ≤20 °, 1.193φ-2 ° ≤ψ≤1.193φ + 2 °, and ψ≤-2φ-3 ° or -2φ + 3 ° ≤ψ; and disposed on the piezoelectric body the main acoustic waves for the wavelength λ of the excitation electrodes.