Abstract: An imaging device comprising an imaging element having a light acceptance plane, a frame surrounding a marginal portion of said imaging element and fixing said imaging element, an image formation lens configured to form an image on said light acceptance plane, a lens-barrel configured to support said image formation lens, and a supporting member on which said lens-barrel is mounted and including legs forming an opening for accommodating said frame and said imaging element, wherein an outside of said frame includes protrusions, the legs of said supporting member include mount portions configured to mount said protrusions, and said protrusions are mounted integrally on said mount portions.