An ultrasonographic device, comprising: an ultrasound probe including an oscillator for generating an ultra-sonic wave; ultrasonic wave transmitter/receiver means (102, 103) connected to the probe for transmitting and receiving the ultrasonic wave to and from a test subject; phasing addition means for controlling the phase of the received ultrasonic wave and generating RF signal frame data; a frame memory for storing the RF signal frame data in time sequence, an RF signal frame data selection section; an elastic frame data calculation section for generating elastic frame data in time sequence based on a pair of the RF signal frame data, the elastic frame data indicating a distortion or an elastic modulus of each point on a tomographic image; and an elastic image generating section (112, 113) for generating an elastic image based on the elastic frame data, statistical processing means for performing statistical processing on two or more of the elastic frame data corresponding to a target processing area and obtaining a statistical characteristic amount; characterised in that the statistical processing means are adapted to set an upper limit value and a lower limit value for imaging the elastic frame data, for each of the elastic frame data based on the statistical characteristic amount; the elastic image generating section includes frame interval optimization means for receiving, from the RF signal frame data selection section, the number of frame intervals between a pair of RF signal frame data used for generating elastic frame data for a current image configuration, and calculating an optimum number of frame intervals of a pair of RF signal frame data to be used for generating elastic frame data for a subsequent image configuration, based on the received number of frame intervals and the statistical characteristic amount, the RF signal frame data selection section is adapted to determine the number of frame intervals between past RF signal frame data and the latest RF signal frame data stored in the frame memory based on the optimum number of frame intervals input from the frame interval optimization means, wherein the past signal frame data and the latest RF signal frame data form the pair of RF signal frame data used for generating the elastic frame data; and the elastic image generating section is adapted to generate the elastic image from the elastic frame data while matching the upper limit value and the lower limit value with a range of a predetermined display gradation. an ultrasound probe including an oscillator for generating an ultra-sonic wave; ultrasonic wave transmitter/receiver means (102, 103) connected to the probe for transmitting and receiving the ultrasonic wave to and from a test subject; phasing addition means for controlling the phase of the received ultrasonic wave and generating RF signal frame data; a frame memory for storing the RF signal frame data in time sequence, an RF signal frame data selection section; an elastic frame data calculation section for generating elastic frame data in time sequence based on a pair of the RF signal frame data, the elastic frame data indicating a distortion or an elastic modulus of each point on a tomographic image; and an elastic image generating section (112, 113) for generating an elastic image based on the elastic frame data, statistical processing means for performing statistical processing on two or more of the elastic frame data corresponding to a target processing area and obtaining a statistical characteristic amount; characterised in that the statistical processing means are adapted to set an upper limit value and a lower limit value for imaging the elastic frame data, for each of the elastic frame data based on the statistical characteristic amount; the elastic image generating section includes frame interval optimization means for receiving, from the RF signal frame data selection section, the number of frame intervals between a pair of RF signal frame data used for generating elastic frame data for a current image configuration, and calculating an optimum number of frame intervals of a pair of RF signal frame data to be used for generating elastic frame data for a subsequent image configuration, based on the received number of frame intervals and the statistical characteristic amount, the RF signal frame data selection section is adapted to determine the number of frame intervals between past RF signal frame data and the latest RF signal frame data stored in the frame memory based on the optimum number of frame intervals input from the frame interval optimization means, wherein the past signal frame data and the latest RF signal frame data form the pair of RF signal frame data used for generating the elastic frame data; and the elastic image generating section is adapted to generate the elastic image from the elastic frame data while matching the upper limit value and the lower limit value with a range of a predetermined display gradation.