A lens mount (301; 501; 1301; 1501) configured to be detachably mountable to a camera mount (201; 401; 1201; 1401) including a plurality of first bayonet claw portions (201a-201c) and a plurality of first terminals (203a-203k, 203m), the lens mount (301; 501; 1301; 1501) comprising: a plurality of second bayonet claw portions (301d-301f) configured to enable engagement with the plurality of first bayonet claw portions (201a-201c); and a plurality of second terminals (303a-303k, 303m) configured to contact with the plurality of first terminals (203a-203k, 203m) when the lens mount (301; 501; 1301; 1501) is mounted to the camera mount (201; 401; 1201; 1401), the plurality of second terminals (303a-303k, 303m) being provided at positions that are different from positions of the plurality of second bayonet claw portions (301d-301f), characterized in that the plurality of second terminals (303a-303k, 303m) includes a plurality of communication terminals (303f-303k) that are used in communication between the lens mount (301; 501; 1301; 1501) and the camera mount (201; 401; 1201; 1401), and a distinction terminal configured to distinguish a type of the lens mount (301; 501; 1301; 1501) mounted on the camera mount (201; 401; 1201; 1401), the number of the plurality of communication terminals (303f-303k) is six, and when viewed in a central axis direction of the lens mount (301; 501; 1301; 1501), a plurality of half lines that extend from a central axis of the lens mount (301; 501; 1301; 1501) and pass through the plurality of communication terminals (303f-303k) all pass through a predetermined bayonet claw portion among the plurality of second bayonet claw portions (301d-301f), and a half line that extends from the central axis and passes through the distinction terminal passes through between the plurality of second bayonet claw portions . a plurality of second bayonet claw portions (301d-301f) configured to enable engagement with the plurality of first bayonet claw portions (201a-201c); and a plurality of second terminals (303a-303k, 303m) configured to contact with the plurality of first terminals (203a-203k, 203m) when the lens mount (301; 501; 1301; 1501) is mounted to the camera mount (201; 401; 1201; 1401), the plurality of second terminals (303a-303k, 303m) being provided at positions that are different from positions of the plurality of second bayonet claw portions (301d-301f), characterized in that the plurality of second terminals (303a-303k, 303m) includes a plurality of communication terminals (303f-303k) that are used in communication between the lens mount (301; 501; 1301; 1501) and the camera mount (201; 401; 1201; 1401), and a distinction terminal configured to distinguish a type of the lens mount (301; 501; 1301; 1501) mounted on the camera mount (201; 401; 1201; 1401), the number of the plurality of communication terminals (303f-303k) is six, and when viewed in a central axis direction of the lens mount (301; 501; 1301; 1501), a plurality of half lines that extend from a central axis of the lens mount (301; 501; 1301; 1501) and pass through the plurality of communication terminals (303f-303k) all pass through a predetermined bayonet claw portion among the plurality of second bayonet claw portions (301d-301f), and a half line that extends from the central axis and passes through the distinction terminal passes through between the plurality of second bayonet claw portions . <EOS>