An elastic wave device includes a piezoelectric substrate, IDT electrodes disposed on the piezoelectric substrate, a first wiring line, an insulating layer covering at least a portion of the first wiring line, a second wiring line at least a portion of which is disposed on the insulating layer to provide a three-dimensional crossing portion, a peripheral support including a cavity surrounding the IDT electrodes, the first and second wiring lines, and the insulating layer, a partition support disposed in the cavity, and a cover disposed on the peripheral support and the partition support to cover the cavity. The second wiring line includes a step portion electrically connecting a portion of the second wiring line located on the piezoelectric substrate and a portion of the second wiring line located on the insulating layer to each other. The partition support covers the step portion.