Frequency adjustment easily and production method of the elastic boundary wave device which has the process which makes that it does in high accuracy possible is offered. You prepare the layered product where IDT electrode 3 is arranged in boundary X between 1st and 2nd medium 1,2 where it consists of solid, 1st medium 1 and/or improving 2nd 2 by granting the energy which can arrive inside 2 from outside in the said layered product, 1st medium and/or, you adjust the frequency of the elastic boundary wave device, each process is had, production method of the elastic boundary wave device.
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