An elastic wave device includes a piezoelectric substrate, an IDT electrode including a first electrode layer which is provided on the piezoelectric substrate and contains Pt as a main component and a second electrode layer which is laminated on the first electrode layer and contains Cu as a main component, and a dielectric film that is provided on the piezoelectric substrate and covers the IDT electrode. The piezoelectric substrate is made of lithium niobate. The dielectric film is made of silicon oxide. The elastic wave device uses Rayleigh waves propagating along the piezoelectric substrate.