(57) [Abstract] The present invention process is easy, as well as a safe natural glue material to the human body can be used at both end mating portions of the flexible sheet material, and be provided with uneven decoration to the upper edge of the circular side wall panels It can hold strength and it is an object to provide an inexpensive Kuruwa ~TsuPa fabrication costs. A Meet at the wooden bottom plate 1 and the circular side wall plate 2 in Pa Tsu Kuruwa that was formed above the opening 3, the grain of the circular side wall plate 2 of the wood, and Zhou drives out flexible plate 4 and it is formed in the longitudinal grain direction 5 perpendicular. The circular side wall plate 2 It is also possible to provide uneven decorations 2a on the edge of the.
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