An endoscope includes a single lens that has a square exterior shape in a direction perpendicular to an optical axis, an image sensor that has an square exterior shape which is same as the exterior shape of the single lens, in the direction perpendicular to the optical axis, a sensor cover that has an exterior shape which is same as the exterior shape of the single lens, in the direction perpendicular to the optical axis； and a bonding resin portion that fixes the sensor cover to the single lens, The single lens is a lens which is formed in a prismatic shape. The single lens has first surface on an imaging subject side that has a plane, and has second surface on an imaging side that has a convex surface.
