<p>A signal-to-noise enhancer 10 which can obtain a good enhancement characteristic readily includes a magnetostatic wave element 30 which in turn includes a strip GGG substrate 32. A YIG thin film 34 as a ferrimagnetic substrate is formed on one main surface of the GGG substrate 32. The magnetostatic wave element 30 is disposed on four transducers 16a through 16d. Then, a first magnetostatic wave filter is composed of the two transducers 16a and 16b, one end portion 30a of the magnetostatic wave element 30 and the like and a second magnetostatic wave filter is composed of the other two transducers 16c and 16d, another end portion 30b of the magnetostatic wave element 30 and the like. <IMAGE></p>
