An ultrasonic diagnosis device, comprising: a transmission/reception unit (10, 12, 14) which is configured to output a transmission signal of an ultrasonic wave and to obtain a reception signal of the ultrasonic wave from a subject, a measurement unit which is configured to measure a displacement of a tissue in the subject on the basis of the reception signal of the ultrasonic wave, and a fluctuation detection unit which is configured to detect a periodic displacement on the basis of the measured displacement of the tissue, wherein: the ultrasonic diagnosis device is configured to transmit a push wave of an ultrasonic wave for generating a shear wave through the subject and to transmit a tracking wave of an ultrasonic wave to the subject, the measurement unit is configured to measure a phase displacement of the tissue after the generation of the shear wave on the basis of the reception signal of the ultrasonic wave which is obtained by the tracking wave, and the fluctuation detection unit is configured to detect the periodic displacement after the generation of the shear wave, wherein the ultrasonic diagnosis device includes a shear wave velocity calculation unit configured to obtain a statistical propagation velocity (Vs) of the shear wave in the subject by using the displacement measurement result at a plurality of depths after the generation of the shear wave measured by the measurement unit and the detection result obtained from the fluctuation detection unit and further wherein the ultrasonic diagnosis device is configured to: - generate, as a time-space map, phase displacement data that show a time along one axis and positions of the plurality of depths along the other axis; - determine a fluctuation band as a region which comprises a plurality of positions at which fluctuation was detected in the time-space map, wherein the phase displacement is affected by the fluctuation in the fluctuation band, and - obtain the statistical propagation velocity (Vs) from the displacement measurement result at the plurality of depths excluding the fluctuation band. a transmission/reception unit (10, 12, 14) which is configured to output a transmission signal of an ultrasonic wave and to obtain a reception signal of the ultrasonic wave from a subject, a measurement unit which is configured to measure a displacement of a tissue in the subject on the basis of the reception signal of the ultrasonic wave, and a fluctuation detection unit which is configured to detect a periodic displacement on the basis of the measured displacement of the tissue, wherein: the ultrasonic diagnosis device is configured to transmit a push wave of an ultrasonic wave for generating a shear wave through the subject and to transmit a tracking wave of an ultrasonic wave to the subject, the measurement unit is configured to measure a phase displacement of the tissue after the generation of the shear wave on the basis of the reception signal of the ultrasonic wave which is obtained by the tracking wave, and the fluctuation detection unit is configured to detect the periodic displacement after the generation of the shear wave, the ultrasonic diagnosis device is configured to transmit a push wave of an ultrasonic wave for generating a shear wave through the subject and to transmit a tracking wave of an ultrasonic wave to the subject, the measurement unit is configured to measure a phase displacement of the tissue after the generation of the shear wave on the basis of the reception signal of the ultrasonic wave which is obtained by the tracking wave, and the fluctuation detection unit is configured to detect the periodic displacement after the generation of the shear wave, wherein the ultrasonic diagnosis device includes a shear wave velocity calculation unit configured to obtain a statistical propagation velocity (Vs) of the shear wave in the subject by using the displacement measurement result at a plurality of depths after the generation of the shear wave measured by the measurement unit and the detection result obtained from the fluctuation detection unit and further wherein the ultrasonic diagnosis device is configured to: - generate, as a time-space map, phase displacement data that show a time along one axis and positions of the plurality of depths along the other axis; - determine a fluctuation band as a region which comprises a plurality of positions at which fluctuation was detected in the time-space map, wherein the phase displacement is affected by the fluctuation in the fluctuation band, and - obtain the statistical propagation velocity (Vs) from the displacement measurement result at the plurality of depths excluding the fluctuation band. - generate, as a time-space map, phase displacement data that show a time along one axis and positions of the plurality of depths along the other axis; - determine a fluctuation band as a region which comprises a plurality of positions at which fluctuation was detected in the time-space map, wherein the phase displacement is affected by the fluctuation in the fluctuation band, and - obtain the statistical propagation velocity (Vs) from the displacement measurement result at the plurality of depths excluding the fluctuation band.