To bend without difficulty and to suppress occurrence of defect such as strand breakage by attaching a plate part having no cut-in line to both ends of an expansible metal in which cut-in parts are expanded to a diamond mesh and bending both end plate parts at the boundary between the expansible metal part and the plate part to an opposite face side at a prescribed angle.

A Z-type expansible metal 1, which connects an expansible metal part 3 between plate parts 2, is formed. It is preferable that both end plate parts 2 are parallel and its shape is a rectangular and holes 20 are arranged to the plate part 2. The plate part 2 is formed to a long, is bent at a right angle and is made to a cylindrical shape in which the expand metal part is intersected, and at least one of functional materials among heat insulation material, sound absorption material, humidity absorption material, planting base material, fertilizer are filled in the cylindrical space. A board-like body is constituted by plural Z-type expansible metals 1 and the plate parts 2 facing. Both end parts of the board-like body are covered by angles to make a compound body.