each other if the display module is large enough if in the case where the windows overlap with each other a user may perform a selection operation by using a pointing device or the like to display a selected window on the forefront side or change a size of the window as described above by using the configuration of this embodiment the analysis data also including the frequency characteristic which changes with the state of the cartilage interior area can be further displayed and more information for evaluating the state of the cartilage can be displayed in the above description the measurement is made without moving the tip of the transducer while the transducer contacts the skin however while the tip of the casing containing the transducer contacting the skin a user may rotate the rear end to change the transmitting direction of the pulse burst signal to acquire the echo signals over a predetermined area alternatively the echo signals may also be acquired while moving the casing itself containing the transducer in these cases the echo area determination module 41 with reference to the detected outer skin side end part of the cartilage surface area may perform an alignment in the depth direction of the partial echo data which constitutes the echo data thereby the influence of the depth difference for the partial echo data for every echo data due to the difference in the transmitting direction of the pulse burst signal can be eliminated and more accurate analysis data can be.