According to one embodiment, a medical image diagnostic apparatus includes processing circuitry. The processing circuitry sets a viewpoint and an observation direction relative to medical image data. The processing circuitry searches for a region that satisfies a predetermined requirement from a search initiation surface set at a predetermined position farther away from the viewpoint in comparison with a non-display region in the medical image data in a direction toward the viewpoint, and calculates a drawing initiation surface based on a result of the search. The processing circuitry executes drawing processing from the drawing initiation surface in the observation direction, and generates display image data.