A surface acoustic wave filter device comprising: a piezoelectric substrate; and first, second and third surface acoustic wave filters (1,2,3) disposed on said piezoelectric substrate, each of said surface acoustic wave filters having a plurality of IDTs arranged along a surface acoustic wave propagation direction; wherein: said second and third surface acoustic wave filters (2,3) are arranged such that they are substantially equal in transmission amplitude characteristic within a band but different in transmission phase characteristic by about 180°; the first surface acoustic wave filter includes a first IDT arranged along a surface acoustic wave propagation direction and also includes second and third IDTs (lb,lc) disposed on respective opposite sides, in the surface acoustic wave propagation direction, of the first IDT; said second and third surface acoustic wave filters (2,3) each include a plurality of IDTs (2a-c,3a-c) disposed along the surface acoustic wave propagation direction; the second IDT of the first surface acoustic wave filter is connected to an IDT (2b/2c) of the second surface acoustic wave filter, and the third IDT of the first surface acoustic wave filter is connected to an IDT (3b/3c) of the third surface acoustic wave filter; and a second space (GI 3) defined in the third surface acoustic wave filter between one of the IDTs (3b/3c) connected to the first surface acoustic wave filter and another of the IDTs connected to an output terminal is different by about 0.48λ to about 0.525λ from a first space (GI 2) defined in the second surface acoustic wave filter between one of the IDTs (2b/2c) connected to the first surface acoustic wave filter and another of the IDTs connected to an output terminal, where λ is the wavelength of the surface acoustic wave. a piezoelectric substrate; and first, second and third surface acoustic wave filters (1,2,3) disposed on said piezoelectric substrate, each of said surface acoustic wave filters having a plurality of IDTs arranged along a surface acoustic wave propagation direction; said second and third surface acoustic wave filters (2,3) are arranged such that they are substantially equal in transmission amplitude characteristic within a band but different in transmission phase characteristic by about 180°; the first surface acoustic wave filter includes a first IDT arranged along a surface acoustic wave propagation direction and also includes second and third IDTs (lb,lc) disposed on respective opposite sides, in the surface acoustic wave propagation direction, of the first IDT; said second and third surface acoustic wave filters (2,3) each include a plurality of IDTs (2a-c,3a-c) disposed along the surface acoustic wave propagation direction; the second IDT of the first surface acoustic wave filter is connected to an IDT (2b/2c) of the second surface acoustic wave filter, and the third IDT of the first surface acoustic wave filter is connected to an IDT (3b/3c) of the third surface acoustic wave filter; and a second space (GI 3) defined in the third surface acoustic wave filter between one of the IDTs (3b/3c) connected to the first surface acoustic wave filter and another of the IDTs connected to an output terminal is different by about 0.48λ to about 0.525λ from a first space (GI 2) defined in the second surface acoustic wave filter between one of the IDTs (2b/2c) connected to the first surface acoustic wave filter and another of the IDTs connected to an output terminal, where λ is the wavelength of the surface acoustic wave.