An imaging device includes: a group of lenses configured to collect incident light； a lens supporting member including a fitting portion into which the group of lenses is fitted； a prism configured to reflect light collected by the group of lenses； and an image sensor having a light receiving unit configured to receive the light reflected by the prism and to perform a photoelectric conversion on the received light to generate an electric signal. The lens supporting member has a cutout or an opening portion into which the prism is fitted. The lens supporting member is connected to a surface of the image sensor where the prism is mounted.
