To enable everyone besides a workman of bamboo work to easily make various constructions by forming handiwork material made of bamboo into a panel structure and combining them.

A plurality of vertical sash bars 3 of prescribed length are mutually brought into contact and arranged in parallel. Horizontal sash bars 4 are placed and retained in the direction orthogonal to the vertical sash bars 3 in the vertical two places on the surfaces of the vertical sash bars 3. Also, a one-side panel is formed by tightly binding the contact parts on the side of the vertical sash bars 3 to the rears of the horizontal sash bars 4. Further, a panel of both sides is formed by mutually matching the rears of two sheets of one-side panel and shifting a crest and a trough and sticking the rears.