Ultrasound medical device and ultrasound diagnostic imaging device

An ultrasound medical device comprising a capsule-type main body configured to incorporate ultrasound transducers, so that the ultrasound transducers in the capsule-type main body, which has been inserted in a tubular body part of a subject, send ultrasound waves to the subject's interiors and receive reflected waves, wherein

• the ultrasound medical device further comprises
• a support configured to be incorporated in the capsule-type main body and to have a form of tube, along the outer circumference of which the ultrasound transducers are arranged, the support having a through-hole axially passing through the tube for maintaining functions of the tubular body part after the capsule-type main body has been inserted into the tubular body part;
• and
• an expansion and contraction body configured to be disposed to cover the ultrasound transducers externally and to include a bag-like container, which is inflated to bring the expansion and contraction body into contact with the wall of the tubular body part.