Acoustic wave filter and multiplexer

An acoustic wave filter comprising:

• a longitudinally coupled resonator acoustic wave filter including n IDT electrodes, where n is an odd number of seven or more;
• and
• a first reference-potential wiring line and a second reference-potential wiring line each connected to a reference potential;
• wherein
• the longitudinally coupled resonator acoustic wave filter includes a first area and a second area, the first area including a first-end-positioned IDT electrode to a center-positioned IDT electrode in a direction in which the n IDT electrodes are arranged side by side, the second area including the center-positioned IDT electrode to a second-end-positioned IDT electrode in the direction in which the n IDT electrodes are arranged side by side;
• each of the IDT electrodes includes a first comb-shaped electrode and a second comb-shaped electrode interdigitated with each other, one of the first comb-shaped electrode and the second comb-shaped electrode in each of the IDT electrodes being connected to a signal potential, an other electrode of the first comb-shaped electrode and the second comb-shaped electrode being connected to the reference potential, a first one in each pair of adjacent IDT electrodes including the first comb-shaped electrode connected to the signal potential, a second one in the pair including the first comb-shaped electrode connected to the reference potential;
• in the first area, all of the first comb-shaped electrodes connected to the reference potential are connected to the first reference-potential wiring line, and the second comb-shaped electrodes connected to the reference potential include the second comb-shaped electrode connected to the first reference-potential wiring line and the second comb-shaped electrode connected to the second reference-potential wiring line;
• and
• in the second area, the first comb-shaped electrodes connected to the reference potential include the first comb-shaped electrode connected to the first reference-potential wiring line and the first comb-shaped electrode connected to the second reference-potential wiring line, and all of the second comb-shaped electrodes connected to the reference potential are connected to the second reference-potential wiring line.