To provide a honeycomb structure with upper and lower honeycomb film joint portions having high strength.

For mutually joining upper and lower joint portions 7 of rain-sealing lozenge-shaped honeycomb films 4, 5, turn-around portions are provided on the upper and lower honeycomb joint portions 7. Ropes or rod portions 6 are inserted into the turn-around portions. The upper and lower honeycomb films are joined to each other via a joint 3 which anchors the ropes or the rod portions 6. This results in very easy honeycomb joining work, very high jointing strength and easy application to a large wall.