A portable ultrasonic diagnostic device, according to the present invention, comprises: a transducer for generating an ultrasonic pulse from an applied electrical pulse, irradiating the ultrasonic pulse to a subject to be diagnosed, and receiving an echo signal； and a main circuit unit for generating an electrical pulse which is to be applied to the transducer, generating scanline data from the echo signal, and transmitting to a portable terminal the scanline data or frame data which comprises a predetermined number of scanline data items, wherein the main circuit unit transmits the scanline data or the frame data, during the time other than the time in which the echo signal is received, and generates the electrical pulse during the time other than the time in which the scanline data or the frame data is transmitted.
