desirable that all these waves propagate parallel to the magnetostrictive film 20 fig2 a shows a magnetoelastic wave device according to a second embodiment of the invention most components of this device are identical to those of the device shown in fig1 a and therefore are designated at the same reference numerals in fig2 a and will not be described in detail the device is characterized in two respects first as is shown in fig2 a both the wave generating section 30 and the wave receiving section 40 are mounted on the magnetostrictive film 20 not on the substrate 10 second the sections 30 and 40 each comprise a meandering electrode of the type illustrated in fig2 b fig3 a shows a magnetoelastic wave device according to a third embodiment of the invention as is shown in fig3 a this device comprises a substrate 10 a bias magnetic field generating section 60 formed on the substrate 10 a first insulation film 70 formed on the section 60 a modulation magnetic field generating section 50 formed on the first insulation film 70 a second insulation film 70 formed on the section 70 a magnetostrictive film 20 formed on the second insulation film 70 a piezoelectric magnetostrictive film 25 formed on the film 20 a wave generating section 30 mounted on one end portion of the film 25 and a wave receiving section 40 mounted on the end portion of the film 25 as is evident from fig3 a the section 50 and 60 are layers the section 50 comprises a planar coil and the section 60 comprises a planar electromagnetic coil the section 50 is.