An object of the present invention is to provide a structure of a playpen that can be changed in a polygonal shape A plurality of upper connecting base 1, a plurality of lower connecting base 2, a plurality of upper lateral pipe 3, is composed of a plurality of lower lateral pipe 4, and a plurality of vertical pipes 5, each along with the deputy seat 12 and 22 of the upper and lower connection seat is rotatably pivotally attached to the main seat 11 and 21 of the upper and lower connection seat 1, 2, meshes with the block and the block on the opposite surface of the main seat and the sub-seat tooth space was used as a possible fastened by screwing parts 10 provided in the ring, upper and lower horizontal pipe, horizontal provided each vertical pipe at both ends to the main seat 11 and the Fukuza 21, vertical connection holes 123,114,214, 223,213, to engage the upper and lower horizontal pipe is inserted into the ..., the resilient latch 30, 40, 50, which was installed in the vertical pipe both ends connection hole 1131, to . screwed part 10 by changing the angle rotated relative to the main seat and the sub-seat Loosen, a square shape surrounding the circle, pentagon, a three-sided, various polygonal such as a rectangle and it can be changed in shapeFIELD 19
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