Present invention provides a single-eye stereoscopic image capturing device which can reduce the discomfort of a photographer by constantly maintaining a parallax quantity of a left-eye image and a right-eye image that are stereoscopically-displayed even if a focus lens is moved. The single-eye stereoscopic image capturing device comprises, a photographic optical system, pupil division part, imaging part, focus lens driving part, parallax correction quantity calculation part, parallax correction part, and output part.