An embodiment of the present invention relates to a membrane guard that is connected to a treatment head including a transducer and a membrane that covers the transducer, and provides a membrane guard comprising: a first opening portion covering a portion of the treatment head; a second opening portion having a cross-sectional area that is less than that of the first opening portion; a circumferential surface surrounding the membrane and connecting the first opening portion and the second opening portion; and a connecting portion formed at the inside of the circumferential surface in order to movably connect the membrane guard to the treatment head.
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