An ultrasonic diagnostic apparatus comprising: 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 (60,160,160',170) to connect the input/output unit and the main body to each other, wherein the connection unit (60,160,160',170) includes: at least one first connection member (65,163,163',165) 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, wherein the at least one first connection member itself has a variable length to move the input/output unit relative to the main body; and a plurality of second connection members (61,62,161,161',162,162') coupled to the first connection members (65,163,163',165) 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, and wherein a first main body coupling part of the first connection member and a second main body coupling part (61a,62a) of the second connection members (61,62) are coupled to the main body and arranged in a first plane, wherein a first input/output coupling part of the first connection member and a second input/output coupling part (61b,62b) of the second connection members are coupled to the input/output unit and arranged in a second plane, wherein the first plane and the second plane are different planes, and characterized in that the plurality of second connection members (61,62,161,161',162,162') has a variable length. 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 (60,160,160',170) to connect the input/output unit and the main body to each other, wherein the connection unit (60,160,160',170) includes: at least one first connection member (65,163,163',165) 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, wherein the at least one first connection member itself has a variable length to move the input/output unit relative to the main body; and a plurality of second connection members (61,62,161,161',162,162') coupled to the first connection members (65,163,163',165) 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, and wherein a first main body coupling part of the first connection member and a second main body coupling part (61a,62a) of the second connection members (61,62) are coupled to the main body and arranged in a first plane, wherein a first input/output coupling part of the first connection member and a second input/output coupling part (61b,62b) of the second connection members are coupled to the input/output unit and arranged in a second plane, wherein the first plane and the second plane are different planes, and characterized in that the plurality of second connection members (61,62,161,161',162,162') has a variable length. at least one first connection member (65,163,163',165) 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, wherein the at least one first connection member itself has a variable length to move the input/output unit relative to the main body; and a plurality of second connection members (61,62,161,161',162,162') coupled to the first connection members (65,163,163',165) 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, and wherein a first main body coupling part of the first connection member and a second main body coupling part (61a,62a) of the second connection members (61,62) are coupled to the main body and arranged in a first plane, wherein a first input/output coupling part of the first connection member and a second input/output coupling part (61b,62b) of the second connection members are coupled to the input/output unit and arranged in a second plane, wherein the first plane and the second plane are different planes, and characterized in that the plurality of second connection members (61,62,161,161',162,162') has a variable length.