<p>A chip for a magnetostatic wave device comprises a base substrate consisting of a dielectric monocrystalline base plate (1) and a ferrimagnetic monocrystalline film (2) formed on the base plate (1), an excitation means (3) formed on the ferrimagnetic film (2) for exciting magnetostatic waves when it is given a bias magnetic field and high frequency electric signals, and a reflection means (4) to reflect the excited magnetostatic wave toward the center portion of the film (2) before it reaches at end portions of the ferrimagnetic film (2).</p>
