ULTRASONIC DIAGNOSTIC DEVICE

PURPOSE:To enable the dynamic focus by giving a delay time to be successively changed in an echo sounder phasing section and switching the echo sounder focus setting range in plural stages in the depth direction. CONSTITUTION:Echo sounder phasing sections 3a and 3b installed on the palallel plural system are constructed by serially connecting variable delay lines 11a and 11b and fixed delay lines 12a and 12b giving a prescribed delay time. A switching device 5 is disposed between the output side of echo sounder phasing sections 3a and 3b in the plural systems and a DSC 6. By switching the switching device 5, while a echo sounder phasing section 3a receives a reception signal of a certain depth section while performing dynamic focusing, the other echor sounder phasing section 3b changes the preset value of delay time so as to perform dynamic focusing on the reception signal in the depth section to be received next.