| 摘要 |
In order to arrange a heater effectively in a case containing ultrasonic sensors to melt frozen snow attached to the case assuredly to ensure the performance of the ultrasonic sensors, an ultrasonic sensor unit comprises ultrasonic sensors ( 9, 10 ), a case ( 11, 12 ) for containing the ultrasonic sensors, and a sheet component ( 20 ) arranged on an inner side of a bottom ( 12 c) of the case to cover the bottom, and having a heater ( 22 ) buried in or mounted on it.
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