Elastic wave filter

An elastic wave filter comprising

• a first filter part and a second filter part in each of which tapered IDT electrodes each including a plurality of electrode fingers and a pair of busbars are disposed as an input-side electrode and an output-side electrode on a piezoelectric substrate so as to be apart from each other in a propagation direction of an elastic wave,
• wherein the input-side electrode of the first filter part and the input-side electrode of the second filter part are arranged in a direction perpendicular to the propagation direction of the elastic wave, and the output-side electrode of the first filter part and the output-side electrode of the second filter part are arranged in the direction perpendicular to the propagation direction of the elastic wave,
• wherein the input-side electrode of the first filter part and the input-side electrode of the second filter part have the same structure, and the output-side electrode of the first filter part and the output-side electrode of the second filter part have the same structure,
• wherein an upper busbar in the input-side electrode of the first filter part and a lower busbar in the input-side electrode of the second filter part are electrically connected to each other, where the upper busbar and the lower busbar are busbars located on an upper side and on a lower side in the respective input-side electrodes when the input-side electrode of the first filter part is disposed on the lower side and the input-side electrode of the second filter part is disposed on the upper side of the input-side electrode of the first filter part,
• wherein an upper busbar in the output-side electrode of the first filter part and a lower busbar in the output-side electrode of the second filter part are electrically connected to each other, where the upper busbar and the lower busbar are busbars located on an upper side and on a lower side in the respective output-side electrodes when the output-side electrode of the first filter part is disposed on the lower side and the output-side electrode of the second filter part is disposed on the upper side of the output-side electrode of the first filter part,
• wherein the lower busbar in the input-side electrode of the first filter part and the upper busbar in the input-side electrode of the second filter part are connected to one and the other of an input port and a ground port respectively, and
• wherein the lower busbar in the output-side electrode of the first filter part and the upper busbar in the output-side electrode of the second filter part are connected to one and the other of an output port and a ground port respectively.