An ultrasonic diagnostic device, comprising: a probe that is adapted to transmit and receive ultrasonic signals to and from a test object; a receiving beamformer unit that is adapted to perform phasing and adding processing with respect to ultrasonic signals received by the probe; an image detection unit that is adapted to accept designation of information containing a starting time (t start) when a contrast agent is administered to the test object; a time intensity curve analysis unit that is adapted to calculate a numeric value required to construct an inflow time map for each pixel of image data obtained from the ultrasonic signal subjected to phasing and adding; a first pixel selection unit that is adapted to extract, on the basis of the information on the starting time (t start), a contrast-enhanced part with the contrast agent from said image data; a second pixel selection unit that is adapted to further extract image data on the basis of pixel information of image data extracted by the first pixel selection unit; an image construction unit that is adapted to generate the inflow time map on the basis of image data extracted by the second pixel selection unit; and a display that is adapted to display the inflow time map, characterized in that the time intensity curve analysis unit includes an analysis unit that is adapted to calculate, as a difference of brightness due to the contrast agent, a difference of brightness ΔI obtained by subtracting a maximum value I pre max in a range before injection of the contrast agent from a threshold brightness I α, the first pixel selection unit is adapted to select a pixel on the basis of the calculated difference of brightness ΔI; and the second pixel selection unit is adapted to extract a focused pixel on the basis of time information calculated based on the difference of brightness ΔI. a probe that is adapted to transmit and receive ultrasonic signals to and from a test object; a receiving beamformer unit that is adapted to perform phasing and adding processing with respect to ultrasonic signals received by the probe; an image detection unit that is adapted to accept designation of information containing a starting time (t start) when a contrast agent is administered to the test object; a time intensity curve analysis unit that is adapted to calculate a numeric value required to construct an inflow time map for each pixel of image data obtained from the ultrasonic signal subjected to phasing and adding; a first pixel selection unit that is adapted to extract, on the basis of the information on the starting time (t start), a contrast-enhanced part with the contrast agent from said image data; a second pixel selection unit that is adapted to further extract image data on the basis of pixel information of image data extracted by the first pixel selection unit; an image construction unit that is adapted to generate the inflow time map on the basis of image data extracted by the second pixel selection unit; and a display that is adapted to display the inflow time map, characterized in that the time intensity curve analysis unit includes an analysis unit that is adapted to calculate, as a difference of brightness due to the contrast agent, a difference of brightness ΔI obtained by subtracting a maximum value I pre max in a range before injection of the contrast agent from a threshold brightness I α, the first pixel selection unit is adapted to select a pixel on the basis of the calculated difference of brightness ΔI; and the second pixel selection unit is adapted to extract a focused pixel on the basis of time information calculated based on the difference of brightness ΔI.