The ultrasonic probe according to the present invention has a cylindrical shape in which end portions of sheet-like members are bonded to each other with an adhesive, and an acoustic matching layer that adjusts the acoustic impedance of the ultrasonic wave, and an inner peripheral surface side of the acoustic matching layer An acoustic matching layer that is arranged along the circumferential direction, emits ultrasonic waves according to the input of electrical signals, and has a plurality of piezoelectric elements that convert ultrasonic waves incident from the outside into echo signals, and a hollow disk shape. A structural member that is provided on at least one end in the longitudinal direction perpendicular to the surface formed by the circumferential direction, and at least a part of the outer surface is fixed to the inside of the acoustic matching layer. A water repellent portion having a water repellency is provided in a region that is a part of the side surface and includes a gap formed by an end portion in the circumferential direction of the acoustic matching layer in a radial direction. 本発明に係る超音波プローブは、シート状の部材の端部同士を接着剤により接着した筒状をなし、超音波の音響インピーダンスを調整する音響整合層と、音響整合層の内周面側に周方向に沿って配列され、電気信号の入力に応じて超音波を出射するとともに、外部から入射した超音波をエコー信号に変換する複数の圧電素子と、中空円板状をなし、音響整合層の周方向のなす面と直交する長手方向の少なくとも一方の端部側に設けられ、外側面の少なくとも一部が音響整合層の内部に固定される構造部材と、を備え、構造部材は、外側面の一部であって、音響整合層の周方向の端部により形成される空隙を径方向で含む領域に設けられ、撥水性を有する撥水部を有する。
