An ultrasonic diagnostic apparatus characterized by comprising: an ultrasonic probe for transmitting/receiving an ultrasonic wave to/from an object a phasing and summing unit for generating RF signal frame data of a cross-sectional site of the object ON the basis of a reflection echo signal measured by the ultrasonic probe an elasticity calculator for generating frame data of elasticity information representing the degree of hardness or softness of a tissue at each measurement point of the cross-sectional site ON the basis of a pair of RF signal frame data acquired in different times a weighting unit for weighting the elasticity information of each measurement point of the generated elasticity frame data in accordance with the degree of sharpness of a distribution of elasticity information for plural measurement points containing adjacent measurement points a smoothing unit for smoothing the weighted elasticity information of the plurality of elasticity frame data generated at the different times and an elasticity image display unit for generating an elasticity image ON the basis of the smoothed elasticity frame data and displaying the generated elasticity image ON a display unit.
