First, the effect of the geometry such as the curved shape of the struts composing the truss structure of WBK is elaborated. Then, analytic solutions for the material properties of WBK and the maximum loads of a WBK-cored sandwich panel under bending are derived. A design optimization with the face sheet thickness and the core height selected as the design variables is presented for given slenderness ratios of the WBK core. Unless the face sheet thickness is limited, the optimal design to give the maximum load per weight is always found at a confluence of three failure modes, namely, face sheet yielding, indentation plastic, and core shear modeB plastic. Key Words : PCM(Periodic Cellular Metal;규칙적 다공질 금속), Kagome Truss(카고메 트러스), Sandwich Panel(샌드위치 판재), Ultra Light Metal Structure(초경량 금속 구조물), WBK(Wire-wounded Bulk Kagome;와이어로 직조된 덩어리 카고메)