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 is a line passing through the center of the restricted portion and a central axis of the lens mount, a first line is a line passing through the central axis 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 is a line passing through the central axis 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 and the second line, characterized in that 90 ° < θ 1 + θ 2 < 180 ° is satisfied, where θ1 is an angle formed between the reference line and the first line, and θ2 is an angle formed between the reference line and the second line. 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 is a line passing through the center of the restricted portion and a central axis of the lens mount, a first line is a line passing through the central axis 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 is a line passing through the central axis 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 and the second line, characterized in that 90 ° < θ 1 + θ 2 < 180 ° is satisfied, where θ1 is an angle formed between the reference line and the first line, and θ2 is an angle formed between the reference line and the second line.