Air spring and bogie

An air spring comprising:

• an inner cylindrical member;
• an outer cylindrical member provided on the inner cylindrical member;
• a diaphragm coupled with the outer cylindrical member and the inner cylindrical member;
• and
• a stopper provided rotatably with respect to a circumferential direction of the inner cylindrical member,
• the stopper having a raised portion raised towards the outer cylindrical member and moving on the inner cylindrical member in the circumferential direction,
• the outer cylindrical member having a plurality of raised portions raised toward the inner cylindrical member,
• the plurality of raised portions of the outer cylindrical member having different heights, respectively,
• at least one of the outer cylindrical member's raised portion and the stopper's raised portion being restorable against deformation caused in a direction perpendicular to a direction from the outer cylindrical member toward the inner cylindrical member,
• wherein at least one of the outer cylindrical member's raised portion and the stopper's raised portion includes a flexible layer, a first metal layer and a second metal layer, and the first and second metal layers sandwich the flexible layer in a direction from the outer cylindrical member toward the inner cylindrical member.