ultrasonic probe of the present disclosure technology, the ultrasonic element unit 2, the frame and the acoustic medium liquid 6 and the ultrasonic element unit 2 the tip storage section 7 that is sealed by the holding member is stored, and the cover member 17a disposed on the surface of the holding member 10a, and the holding member 10a further comprising an acoustic medium liquid reservoir portion 15a for storing the acoustic medium liquid 6 in the space formed by the cover member 17a, the holding member 10a is communication with the interior of said acoustic medium liquid reservoir portion 15a and the tip storage section 7 has at least one communication path, said cover member has at least one ventilation passage communicates with the outside of the acoustic medium liquid reservoir portion and the tip storage section, the acoustic medium liquid reservoir portion is the ventilating passage is communicated the communication passage cross-sectional area of the space portion of the I constructed larger than the cross-sectional area of the space portion communicates.本開示技術の超音波探触子は、超音波素子ユニット2と、枠に音響媒体液6と前記超音波素子ユニット2が格納され保持部材で封止された先端格納部7と、前記保持部材10aの表面に配設されたカバー部材17aと、前記保持部材10aと前記カバー部材17aにより形成される空間に前記音響媒体液6を貯留する音響媒体液溜まり部15aを備え、前記保持部材10aは前記音響媒体液溜まり部15aと前記先端格納部7の内部と連通する少なくとも1つの連通路を有し、前記カバー部材は前記音響媒体液溜まり部と前記先端格納部の外部と連通する少なくとも1つの換気路を有し、前記音響媒体液溜まり部は前記換気路が連通する部分の空間の断面積が前記連通路が連通する部分の空間の断面積よりも大きく構成した。
