A surface acoustic wave device (1) includes a piezoelectric substrate, first and second input transducers (2) formed on the substrate and adapted for respectively generating surface acoustic waves corresponding to input signals, the first and second input transducers (2) each having a shape to focus the surface acoustic waves generated thereby, an output transducer (3) formed between the first and second input transducers (2) on the substrate and adapted for obtaining a convolution signal of the surface acoustic waves generated by the first and second input transducers (2), and conductive films (4,14,24), one formed between the first input transducer and the output transducer and another between the second input transducer and the output transducer on the substrate.