Provided is an ultrasonic diagnostic apparatus that constructs and displays a 3-dimenisonal elastic image showing the hardness or softness of a biological tissue of an object to be examined, and a method of displaying an ultrasonic image. The ultrasonic diagnostic apparatus is characterized by being provided with an elastic image constructing unit (24) that constructs 2-dimensional elastic image data on the basis of the strain or elasticity modulus acquired by the elasticity information calculating unit (23), an elastic volume data creating unit (26) that creates elastic volume data from plural sets of the 2-dimensional elastic image data, and a 3-dimensional elastic image constructing unit (28) that constructs a 3-dimensional elastic image from the elastic volume data.
