The pressure device and the ultrasonic probe and the ultrasonic diagnostic device which do pressure operation smoothly are offered. Installing in the ultrasonic sending and receiving aspect of the ultrasonic probe, it has the balloon which is used, the balloon, fill/is connected the liquid by the margin of the tube and the pressure section which are made to discharge in the pressure section and the pressure section of the air which is formed with elastic member in the pressure device which presses the suffering inspection body with the said balloon, possesses with the applied part which makes the pressure section the ultrasonic sending and receiving aspect of the ultrasonic probe install, inside diameter of the applied part or the pressure section is smaller formed than major diameter of the suffering applied part of the ultrasonic probe. Because tension is granted to the pressure section, pressure can be started rapidly at the little early injection rate. Depending, it is possible to do pressure operation smoothly.円滑に圧迫操作を行なう圧迫装置ならびに超音波探触子及び超音波診断装置を提供する。超音波探触子の超音波送受信面に装着して用いられるバルーンを備え、該バルーンで被検体を圧迫する圧迫装置において、バルーンは、弾性部材で形成される中空の圧迫部と、圧迫部に液体を注入/排出させるチューブと、圧迫部の周縁に連接され、超音波探触子の超音波送受信面に圧迫部を装着させる装着部とを有し、装着部又は圧迫部の内径は超音波探触子の被装着部の外径より小さく構成される。圧迫部に張力が付与されるため、少ない初期注入量で圧迫を速やかに開始できる。よって、円滑に圧迫操作を行なうことができる。
