This ultrasonic diagnostic apparatus comprises: an operation unit with which a time division of a staining commencement time when a contrast agent enters is specified for each pixel of an ultrasonic image which is constructed chronologically with the ultrasonic diagnostic apparatus； and an image analyzing unit which determines a color assignment according to the time division of the staining commencement time, and applies a color to the pixel of the ultrasonic image with the determined color assignment, generating a contrast progress image.
