ACOUSTIC WAVE BRANCHING FILTER

There is provided an acoustic wave branching filter having excellent characteristics of the isolation between a receiving side acoustic wave filter chip and a transmitting side acoustic wave filter chip. The acoustic wave branching filter (1) comprises a receiving side surface acoustic wave filter chip (4) and a transmitting side surface acoustic wave filter chip (3) both mounted on a substrate (2) having first and second balance terminals (7, 8) and a common terminal (5). At least one of the transmitting side surface acoustic wave filter chip (3) and the receiving side surface acoustic wave filter chip (4) is a balanced-type filter section having first and second balanced signal terminals served as input terminals or output terminals. The acoustic wave branching filter (1) further comprises a first wiring (15) connecting the balanced-type filter section to the first balanced terminal (7) and a second wiring (16) connecting the balanced-type filter section to the second balanced terminal (8). The first and second wirings (15, 16) are isolated from each other and intersect with each other.