An ultrasonic diagnostic apparatus according to a present embodiment includes: a transmitting and receiving circuit configured to transmit an ultrasonic wave to an ultrasonic probe and receive a signal based on the ultrasonic wave received by the ultrasonic probe a generation circuit configured to generate multiple 2D image data in a chronological order based on the signal an acquisition circuit configured to acquire multiple positional data of the ultrasonic probe a memory circuit a processing circuit configured to perform processing in such a manner that the multiple 2D image data arranged in the memory circuit according to the multiple positional data fit inside a memory space of the memory circuit and a volume generation circuit configured to generate volume data in the memory space based on the processed multiple 2D image data.
