An ultrasonic diagnostic apparatus comprising: an ultrasonic probe comprising an ultrasonic transmitting and receiving surface and a reference deformable body attached on said surface and including a scatterer; a tomographic image constructing unit configured to transmit and receive ultrasonic waves to and from an object to be examined via the reference deformable body, and generate a tomographic image based on a RF signal frame data of a cross-sectional region of the object; a display unit configured to display the tomographic image; a storing unit configured to store the relationship between an ID appended to the reference deformable body and a type of the reference deformable body; a type identifying unit configured to read out a type of the reference deformable body corresponding to the ID of the reference deformable body which is attached to the ultrasonic probe, and identify the type of the reference deformable body; and an image analyzing unit configured to analyze a feature quantity of the reference deformable body in the tomographic image, characterized in that: the storing unit is adapted to store the relationship between the analyzed feature quantity of the reference deformable body and a type of the reference deformable body, and the type identifying unit is adapted to read out the type of the reference deformable body corresponding to the feature quantity of the reference deformable body in a newly-obtained tomographic image, and identify the type of the reference deformable body, and in that: the feature quantity is the average value of the echo luminance in the tomographic image, and the type identifying unit is adapted to identify the type of the reference deformable body based on the average value of the echo luminance in a newly-obtained tomographic image; or the feature quantity is the echo luminance of the scatterer included in the reference deformable body, and the type identifying unit is adapted to identify the type of the reference deformable body based on the pattern, size or form of the scatterer in a newly-obtained tomographic image. an ultrasonic probe comprising an ultrasonic transmitting and receiving surface and a reference deformable body attached on said surface and including a scatterer; a tomographic image constructing unit configured to transmit and receive ultrasonic waves to and from an object to be examined via the reference deformable body, and generate a tomographic image based on a RF signal frame data of a cross-sectional region of the object; a display unit configured to display the tomographic image; a storing unit configured to store the relationship between an ID appended to the reference deformable body and a type of the reference deformable body; a type identifying unit configured to read out a type of the reference deformable body corresponding to the ID of the reference deformable body which is attached to the ultrasonic probe, and identify the type of the reference deformable body; and an image analyzing unit configured to analyze a feature quantity of the reference deformable body in the tomographic image, characterized in that: the storing unit is adapted to store the relationship between the analyzed feature quantity of the reference deformable body and a type of the reference deformable body, and the type identifying unit is adapted to read out the type of the reference deformable body corresponding to the feature quantity of the reference deformable body in a newly-obtained tomographic image, and identify the type of the reference deformable body, and in that: the feature quantity is the average value of the echo luminance in the tomographic image, and the type identifying unit is adapted to identify the type of the reference deformable body based on the average value of the echo luminance in a newly-obtained tomographic image; or the feature quantity is the echo luminance of the scatterer included in the reference deformable body, and the type identifying unit is adapted to identify the type of the reference deformable body based on the pattern, size or form of the scatterer in a newly-obtained tomographic image. the feature quantity is the average value of the echo luminance in the tomographic image, and the type identifying unit is adapted to identify the type of the reference deformable body based on the average value of the echo luminance in a newly-obtained tomographic image; or the feature quantity is the echo luminance of the scatterer included in the reference deformable body, and the type identifying unit is adapted to identify the type of the reference deformable body based on the pattern, size or form of the scatterer in a newly-obtained tomographic image.