An ultrasonic diagnostic apparatus for acquiring an ultrasonic image by scanning, with ultrasonic waves, a predetermined region of an object to which a contrast medium is administered, the apparatus characterized by comprising: an ultrasonic transmission/reception unit (12, 21) configured to transmit ultrasonic waves to a two-dimensional area or a three-dimensional area, which includes the predetermined region, as a scan area throughout an analysis period, receive reflected waves from the scan area, and acquire ultrasonic data associated with the scan area for each phase in the analysis period; an analysis unit (24, 25) configured to generate a luminance time curve associated with at least one analysis area included in the scan area by using the ultrasonic data in each phase in the analysis period and to analyze a stagnant time of the contrast medium associated with said at least one analysis area based on the generated luminance time curve; an image generation unit (24, 25) configured to generate a stagnant time image for each phase in the analysis period, with different hues being assigned to said at least one analysis area in accordance with the stagnant times; and a display unit configured to display the stagnant time image for said each phase, characterized in that the analysis unit (24, 25) is configured to compare a signal intensity in said at least one analysis area with a predetermined threshold in each phase in the analysis period by using the generated luminance time curve, and to start measuring the stagnant time at a timing when the signal intensity exceeds the predetermined threshold, and to finish measuring the stagnant time at a timing when the signal intensity becomes lower than the predetermined threshold, and further characterized in that the image generation unit (24, 25) is configured to calculate the arrival time of the contrast medium and the duration of presence of the contrast medium, wherein said duration is the stagnant time, and to assign the hues to the at least one analysis area using a correspondence map constituted by two axes, an arrival time axis and a duration axis. an ultrasonic transmission/reception unit (12, 21) configured to transmit ultrasonic waves to a two-dimensional area or a three-dimensional area, which includes the predetermined region, as a scan area throughout an analysis period, receive reflected waves from the scan area, and acquire ultrasonic data associated with the scan area for each phase in the analysis period; an analysis unit (24, 25) configured to generate a luminance time curve associated with at least one analysis area included in the scan area by using the ultrasonic data in each phase in the analysis period and to analyze a stagnant time of the contrast medium associated with said at least one analysis area based on the generated luminance time curve; an image generation unit (24, 25) configured to generate a stagnant time image for each phase in the analysis period, with different hues being assigned to said at least one analysis area in accordance with the stagnant times; and a display unit configured to display the stagnant time image for said each phase, characterized in that the analysis unit (24, 25) is configured to compare a signal intensity in said at least one analysis area with a predetermined threshold in each phase in the analysis period by using the generated luminance time curve, and to start measuring the stagnant time at a timing when the signal intensity exceeds the predetermined threshold, and to finish measuring the stagnant time at a timing when the signal intensity becomes lower than the predetermined threshold, and further characterized in that the image generation unit (24, 25) is configured to calculate the arrival time of the contrast medium and the duration of presence of the contrast medium, wherein said duration is the stagnant time, and to assign the hues to the at least one analysis area using a correspondence map constituted by two axes, an arrival time axis and a duration axis.