An ultrasonic imaging device selectively obtains an accurate image of a target part inside an object or an image of a wide part inside the object through an ultrasonic probe by operating a focus adjustment unit. The ultrasonic imaging device includes an ultrasonic probe the front of which is equipped with a probe lens, and a focus adjustment unit mounted to the ultrasonic probe so as to selectively defocus the probe lens. The focus adjustment unit includes a focus adjustment portion arranged in the front of the probe lens, and a pressing portion connected to the focus adjustment portion so as to vary a curvature of the focus adjustment portion by external force.
