Ultrasound medical apparatus and ultrasound diagnosis apparatus are provided capable of indwelling in the observation object at a desired position of the inner cavity of the subject.The ultrasound medical apparatus according to the embodiments include a sheath, a capsule body unit, and a fixation mechanism. The sheath is inserted into the inner cavity of a subject, having an outer peripheral surface that contacts the inner wall surface of the inner cavity of the subject with a liquid filled inside thereof. The capsule body unit is inserted into the sheath, and configured to store an ultrasound transducer that transmits and receives ultrasound waves to and from the subject. The fixation mechanism is provided in at least one of the capsule body unit and the sheath, to fixedly arrange the capsule body unit at a desired position in the sheath.
