Abstract: A honeycomb curtain wall is made up of composite honeycomb panels with a honeycomb core having t and c (t: plate thickness of the honeycomb core material, c: cell size of the honeycomb core) selected so that the warping amount of the panel by heat distortion becomes less than a specified value in the relationship between the warping amount and t/c and frames placed at the periphery. The composite honeycomb panel can be mounted directly on the building main frame and can withstand outer pressure loads to the exterior walls of the building because the rigidity of the honeycomb panel removes the need for additional bracing. Peripheral frames compose the joining portions of adjacent materials. This structure enables the use of large honeycomb panels and a simple construction process as well as increasing the effective room space of the building due to a reduced total wall thickness.