Curtain airbag

A curtain airbag comprising:

• an airbag body which is accommodated in a folded state on an upper peripheral side of a window on an inboard side of a vehicle, and of which an upper periphery is fixedly mounted on a body side of the vehicle to be deployable downward to cover an inboard side of the window when an inflation gas flows in;
• and
• a connection belt which is disposed in an end of the airbag body in a front and rear direction such that a tension is generated in the airbag body at a time of completion of inflation along the front and rear direction, and has a tip connected with a pillar on a peripheral side of the window in the front and rear direction and a base portion connected with the airbag body, wherein:
• the connection belt extending from the tip to the base portion as a connection portion connected with the airbag body is configured to be arranged substantially along the front and rear direction so as to cover a portion of an end periphery of the airbag body in the front and rear direction and an inflatable portion of the airbag body on an outboard side wall side of the airbag body in a proper arrangement state of being flatly deployed together with the airbag body before folding;
• and
• a mark for checking the proper arrangement state of the connection belt is arranged to be visually recognized from at least the outboard side wall side in a vicinity of each of an upper periphery and a lower periphery of the connection belt in the proper arrangement state in the airbag body in the state of being flatly deployed before folding.