| 摘要 |
Disclosed herein is an ultrasonic sensor including: a case; a piezoelectric element mounted on an inner side bottom surface of the case; a first sound absorbing material having a through-hole formed at an area thereof corresponding to a mounting area of the piezoelectric element and including the piezoelectric element disposed at a portion thereof based on a thickness of the through-hole; and a second sound absorbing material formed on the first sound absorbing material so as to cover the entire surface of the first sound absorbing material including the through-hole, wherein the through-hole formed has a thickness thicker than that of the piezoelectric element.
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