The caustic of magnetoelastic waves (MEW) propagating in a thick Y3Fe5O12 film is in-vestigated. The frequency range is obtained where the MEW caustic occurs. The caustics directions as a function of the wave frequency are calculated.The research was carried out within the state assignment of FASO of Russia (theme ``Function'' AAAA-A19-119012990095-0), supported by Basic Research Program of the Presidium of the Russian Academy of Sciences (project No. 13-1.1.3.5)
