maximum number of elements available for transmission is set up to be 48 pieces and thus 48 pieces of element are used for transmission with respect to receiving in a similar fashion to that of fig1 the receiving is implemented using 60 pieces of element the number of which is a maximum assuming symmetry with respect to right and left with the starting point 3 in the center performing the transmitting and receiving scans as shown in fig1 and 2 provides as shown in fig3 a sector configuration of scan with a cross point 2 within the human body in the center fig4 shows a distribution of the number of elements for transmitting and receiving to the shift of scan lines incidentally if intensity of the received signal of the scan line on the edge portion is insufficient owing to shortage of the elements it is possible to facilitate an observation by increasing an amplification factor of the scan line on the edge portion fig5 8 are each a typical illustration of ultrasonic wave transmitting and receiving according to an embodiment of the second ultrasonic diagnostic apparatus of the present invention according to the present embodiment as to an arrangement involved in receiving that in the embodiment shown in.