Unstable depth perception of aerial image in crossed-mirror array (CMA) can be improved by changing distance of fixation point. Perceived depths of aerial image in CMA have large instability even when aerial image is geometrical optical real image. Perceived depth instability of aerial images is mainly influenced by geometrical position of aerial image from CMA. Perceived depths of aerial images are shifted toward the position of fixation point, and stable depth perception of aerial images can be obtained if fixation point is located near aerial image distance. In order to stabilize the depth perception of the aerial image, it is sufficient to appropriately control observer’s vergence even if the fixation point is not the real object.