In embodiments of an ultrasound medical apparatus, main body part includes ultrasound transducer and is inserted into lumen of subject. First and second blocking parts are inserted into lumen and capable of substantially occluding lumen by changing dimensions. First blocking part is arranged at the opposite side to insertion opening across main body part, and is provided, on surface of insertion opening side, with shieldable opening. Second blocking part is arranged at insertion opening side across main body part, and is provided with path penetrating itself. Fluid supplying part supplies fluid in a state in which its tip part is arranged inside first blocking part through opening to enlarge dimension, and supplies fluid in a state in which tip part is arranged in path to enlarge dimension of second blocking part. Liquid supplying part supplies liquid into space between first and second blocking parts.
