1. An image capturing device comprising: a first imaging unit configured to capture an image showing a subject in front; a convex reflector located behind an imaging plane of an optical system formed by the first imaging unit and configured to share an optical axis with the first imaging unit and mirror at least a subject beside the convex reflector, a convex portion of the convex reflector being oriented forward; a second imaging unit configured to share the optical axis with the first imaging unit and capture an image mirrored by the convex reflector; and an image processing unit configured to adjust a resolution of an image captured by the first imaging unit and an image captured by the second imaging unit, obtain a mirror-reversed image from the image captured by the first imaging unit or the image captured by the second imaging unit, and blends the mirror-reversed image with the other image.