A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal (10), balanced terminals (20), a piezoelectric substrate, a first surface acoustic wave filter unit (11), a second surface acoustic wave filter unit (12), an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit (11) and the second surface acoustic wave filter unit (12) to each other, and ground wiring lines. The first surface acoustic wave filter unit (11) includes a first IDT (111) and a pair of a second IDT and a third IDT (112). The first IDT (111) includes a pair of first divided comb tooth shaped electrodes (111a) obtained by dividing a comb tooth shaped electrode on the side far from the unbalanced terminal (10) along a central axis x. The pair of first divided comb tooth shaped electrodes (111a) are connected by the interstage wiring lines to the second surface acoustic wave filter unit (12). A comb tooth shaped electrode of the second IDT and a comb tooth shaped electrode of the third IDT (112) on the side far from the unbalanced terminal (10) are respectively connected to ground wiring lines that are routed outside of the interstage wiring lines.