(57) [summary] [purpose] excellent storability, it is lightweight, and provides a Misao rolling device that can commonality of parts. [Configuration] outer shell part 2 composed of a spherical split 20 or the like is to form an equilateral triangle which is bent at the bottom rib 5 and the side ribs 6, 6 made of a resin, side ribs 6 from the central portion of the bottom rib 5, By convergence with the 6 constituted by an intermediate rib 8 made of resin connecting the resin of the central rib 7 and the central rib 7 and the side ribs 6, 6 to integrally connected to, the adjacent bottom ribs 5 and the side ribs 6,6 It was divided and demolition configured to be able to spheres by the bolt insertion holes 9, 9 in pairs, respectively by inserting the bolts are fastened with nuts.
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