Provided is an ultrasonic diagnostic device cover which has excellent acoustic coupling, and can be easily fitted to an ultrasonic diagnostic device. The ultrasonic diagnostic device cover covers an ultrasonic diagnostic device and comprises: a cylindrical shaped body which is formed into a cylindrical shape having an opening on each end, and in which the ultrasonic diagnostic device can be inserted into one of the two openings； and a probe cover body which seals off the other opening, and which is provided to the cylindrical shaped body such that a probe is in close contact with said probe cover body, and in which the section in close contact with the probe is made from a gel material that enables acoustic coupling between a sensor and a subject.
