Patent ID: 8678678

Claim:
An adapter comprising: a first housing portion that comprises a first mount portion which a camera body can be attached to and detached from via a camera body mount, and a second mount portion which is provided so as to be separated from the first mount portion and which an interchangeable lens can be attached to and detached from via an interchangeable lens mount which has a different size from that of the camera body mount; a second housing portion that is integrally formed with the first housing portion; an adapter side mounting seat, which is arranged at the second housing portion and which can be attached to and detached from an installation base for photographing; wherein the first mount portion is provided at a first surface side of the first housing portion, wherein the second housing portion comprises a protruding portion which protrudes outwardly beyond an end surface of the first housing portion, the end surface of the first housing portion being at a side of the first housing portion facing in a direction opposite to the first surface side of the first housing portion, and wherein the adapter side mounting seat is arranged further on an inside than a lens side mounting seat in relation to a radial direction with an optical axis of the interchangeable lens as a center when the interchangeable lens is mounted on the second mount portion, the interchangeable lens comprising the lens side mounting seat which can be attached to and detached from the installation base for photographing.