Disclosed is an ultrasonic diagnostic apparatus including a main body, at least one input/output unit coupled to one side of the main body to input data to the main body or to output data transmitted from the main body, and a connection unit to connect the input/output unit and the main body to each other. The connection unit includes plural first connection members, each of which is connected at one end thereof to the main body and at the other end thereof to at least a portion of the input/output unit and has a variable length to move the input/output unit relative to the main body, and at least one second connection member coupled to the first connection members and at least one of the main body or the input/output unit so as to come into contact with the same at a point to support load of the input/output unit.