The ultrasonic diagnostic apparatus is equipped with: a gradient calculating section that calculates gradients of the volume data voxel values a feature calculating section that calculates the feature values of the voxels on the basis of the gradients and the direction of the ultrasonic beam and calculates a feature space on the basis of the feature values an object-voxel determining section that determines the voxels that correspond to the object on the basis of the feature space a voxel removing section that removes voxels that are closer to the probe than the object and an ultrasonic image generating unit that generates ultrasonic images that correspond to the object from the volume data from which the voxels closer to the probe have been removed.
