A lens mount (101; 1101) configured to be detachably mountable to a camera mount (201; 1201) having a restricting portion (203; 1203) and a plurality of first bayonet claw portions (208a, 208b, 208c; 1208a, 1208b, 1208c), the lens mount (101;1101) comprising: a plurality of second bayonet claw portions (107a, 107b, 107c; 1107a, 1107b, 1107c) configured to enable engagement with the plurality of first bayonet claw portions (208a, 208b, 208c; 1208a, 1208b, 1208c), and a restricted portion (102; 1102) configured to be restricted by the restricting portion (203; 1203) when the lens mount (101; 1101) is mounted to the camera mount (201; 1201), wherein the plurality of second bayonet claw portions (107a, 107b, 107c; 1107a, 1107b, 1107c) includes first and second adjacent bayonet claw portions (107c, 107b; 1107c, 1107b) adjacent to the restricted portion (102; 1102) in a circumferential direction, and an opposite side bayonet claw portion (107a; 1107a) disposed on an opposite side of the restricted portion (102; 1102) with respect to the first and second adjacent bayonet claw portions (107c, 107b; 1107c, 1107b) in the circumferential direction, and wherein, when viewed in a central axis direction of the lens mount, a reference line (L1) is a line passing through the center of the restricted portion and a central axis (O) of the lens mount, a first line (L3) is a line passing through the central axis (O) and an end (107c1; 1107c1) of the first adjacent bayonet claw portion (107c; 1107c) that is closer to the restricted portion (102; 1102), and a second line (L4) is a line passing through the central axis (O) and an end (107b2; 1107b2) of the second adjacent bayonet claw portion (107b; 1107b) that is closer to the restricted portion (102; 1102), the restricted portion (102; 1102) is positioned at a region between the first line (L3) and the second line (L4), characterized in that 90 ° < θ 1 + θ 2 < 180 ° is satisfied, where θ1 is an angle formed between the reference line (L1) and the first line (L3), and θ2 is an angle formed between the reference line (L1) and the second line (L4). a plurality of second bayonet claw portions (107a, 107b, 107c; 1107a, 1107b, 1107c) configured to enable engagement with the plurality of first bayonet claw portions (208a, 208b, 208c; 1208a, 1208b, 1208c), and a restricted portion (102; 1102) configured to be restricted by the restricting portion (203; 1203) when the lens mount (101; 1101) is mounted to the camera mount (201; 1201), wherein the plurality of second bayonet claw portions (107a, 107b, 107c; 1107a, 1107b, 1107c) includes first and second adjacent bayonet claw portions (107c, 107b; 1107c, 1107b) adjacent to the restricted portion (102; 1102) in a circumferential direction, and an opposite side bayonet claw portion (107a; 1107a) disposed on an opposite side of the restricted portion (102; 1102) with respect to the first and second adjacent bayonet claw portions (107c, 107b; 1107c, 1107b) in the circumferential direction, and wherein, when viewed in a central axis direction of the lens mount, a reference line (L1) is a line passing through the center of the restricted portion and a central axis (O) of the lens mount, a first line (L3) is a line passing through the central axis (O) and an end (107c1; 1107c1) of the first adjacent bayonet claw portion (107c; 1107c) that is closer to the restricted portion (102; 1102), and a second line (L4) is a line passing through the central axis (O) and an end (107b2; 1107b2) of the second adjacent bayonet claw portion (107b; 1107b) that is closer to the restricted portion (102; 1102), the restricted portion (102; 1102) is positioned at a region between the first line (L3) and the second line (L4), characterized in that 90 ° < θ 1 + θ 2 < 180 ° is satisfied, where θ1 is an angle formed between the reference line (L1) and the first line (L3), and θ2 is an angle formed between the reference line (L1) and the second line (L4). <EOS>