Elastic wave device and electronic component

An elastic wave device comprising:

• a first propagation mode portion provided in an elastic wave waveguide made of an elastic body material;
• a trapping energy mode portion provided in the elastic wave waveguide and in which a second elastic wave being an elastic wave in an energy trapping mode is excited by a specific frequency component included in a first elastic wave being an elastic wave in a zero-order propagation mode propagated from the first propagation mode portion;
• a cutoff portion provided in a peripheral region of the trapping energy mode portion and having a cutoff frequency being a frequency higher than that of the second elastic wave;
• and
• a second propagation mode portion provided at a position adjacent to the trapping energy mode portion across the cutoff portion along a direction in which the first elastic wave propagates, and mode-converting the second elastic wave leaked through the cutoff portion to a third elastic wave being the elastic wave in the zero-order propagation mode to propagate the third elastic wave.