An ultrasonic imaging apparatus comprising: a main body; a probe configured to irradiate ultrasonic waves and to receive ultrasonic waves, and connected to the main body to transmit an ultrasonic signal corresponding to the received ultrasonic waves to the main body; a display unit connected to the main body in such a manner to be movable with respect to the main body; and a moving unit configured to connect the display unit to the main body, and to enable the display unit to move with respect to the main body, wherein the moving unit comprises: - a first coupling member rotatably attached on a part of the main body, wherein the first coupling member is configured to be rotatable on a first plane; - a rotating arm coupled with the first coupling member, wherein the rotating arm is configured to rotate together with the first coupling member on the first plane and is further configured to rotate with respect to the first coupling member on a second plane that is vertical to the first plane; - a moving member having one end coupled with the display unit, and said moving member is inserted into a moving groove formed in the rotating arm to be slidably coupled with the rotating arm to enable the display unit to move in a longitudinal direction of the rotating arm; - a second coupling member rotatably coupled with the display unit, wherein the second coupling member is disposed at the one end of the moving member; - a rack gear formed at one lateral side of the moving member; and - a pinion gear installed in the rotating arm and interlocked with the rack gear. a main body; a probe configured to irradiate ultrasonic waves and to receive ultrasonic waves, and connected to the main body to transmit an ultrasonic signal corresponding to the received ultrasonic waves to the main body; a display unit connected to the main body in such a manner to be movable with respect to the main body; and a moving unit configured to connect the display unit to the main body, and to enable the display unit to move with respect to the main body, wherein the moving unit comprises: - a first coupling member rotatably attached on a part of the main body, wherein the first coupling member is configured to be rotatable on a first plane; - a rotating arm coupled with the first coupling member, wherein the rotating arm is configured to rotate together with the first coupling member on the first plane and is further configured to rotate with respect to the first coupling member on a second plane that is vertical to the first plane; - a moving member having one end coupled with the display unit, and said moving member is inserted into a moving groove formed in the rotating arm to be slidably coupled with the rotating arm to enable the display unit to move in a longitudinal direction of the rotating arm; - a second coupling member rotatably coupled with the display unit, wherein the second coupling member is disposed at the one end of the moving member; - a rack gear formed at one lateral side of the moving member; and - a pinion gear installed in the rotating arm and interlocked with the rack gear. - a first coupling member rotatably attached on a part of the main body, wherein the first coupling member is configured to be rotatable on a first plane; - a rotating arm coupled with the first coupling member, wherein the rotating arm is configured to rotate together with the first coupling member on the first plane and is further configured to rotate with respect to the first coupling member on a second plane that is vertical to the first plane; - a moving member having one end coupled with the display unit, and said moving member is inserted into a moving groove formed in the rotating arm to be slidably coupled with the rotating arm to enable the display unit to move in a longitudinal direction of the rotating arm; - a second coupling member rotatably coupled with the display unit, wherein the second coupling member is disposed at the one end of the moving member; - a rack gear formed at one lateral side of the moving member; and - a pinion gear installed in the rotating arm and interlocked with the rack gear.