A jungle gym joint (30A to 30L) having: a joint main body having joint shafts to which a plurality of pipes are connected individually; and a rotary member which has a rod shape and to one end side of which the pipe is connected, wherein a folding portion is formed at the other end side of the rotary member where a flat plate portion is inserted into a bifurcate portion so as to be held therein so that the pipe can be folded together with the joint main body, wherein a cylindrical cover member is provided on an outer circumference of the folding portion so as to rotate freely about an axis thereof while being restricted from moving in the direction of the axis, and wherein the cover member comprises a restricting wall portion which restricts the folding portion from being folded by bringing a circumferential wall into abutment with the flat plate portion or the bifurcate portion and a cutout portion which is formed by cutting out the circumferential wall so as to prevent the abutment of the circumferential wall with the flat plate portion or the bifurcate portion to thereby release the folding of the folding portion, characterised in that the joint further comprises a rotation restricting projection (32c4) having a projecting arc-like shape when viewed from thereabove which is provided on a projecting end portion (32c3) of the flat plate portion so as to project from the projecting end portion (32c3), and wherein a surface of the bifurcate portion defined between two fork portions thereof which faces the projecting end portion (32c3) of the flat plate portion is formed into a recessed arc-like shape when viewed from thereabove so as to follow the projecting end portion (32c3) of the flat plate portion and includes an abutment portion (33b4) which is brought into abutment with the rotation restricting projection (32c4). a joint main body having joint shafts to which a plurality of pipes are connected individually; and a rotary member which has a rod shape and to one end side of which the pipe is connected, wherein a folding portion is formed at the other end side of the rotary member where a flat plate portion is inserted into a bifurcate portion so as to be held therein so that the pipe can be folded together with the joint main body, wherein a cylindrical cover member is provided on an outer circumference of the folding portion so as to rotate freely about an axis thereof while being restricted from moving in the direction of the axis, and wherein the cover member comprises a restricting wall portion which restricts the folding portion from being folded by bringing a circumferential wall into abutment with the flat plate portion or the bifurcate portion and a cutout portion which is formed by cutting out the circumferential wall so as to prevent the abutment of the circumferential wall with the flat plate portion or the bifurcate portion to thereby release the folding of the folding portion, characterised in that the joint further comprises a rotation restricting projection (32c4) having a projecting arc-like shape when viewed from thereabove which is provided on a projecting end portion (32c3) of the flat plate portion so as to project from the projecting end portion (32c3), and wherein a surface of the bifurcate portion defined between two fork portions thereof which faces the projecting end portion (32c3) of the flat plate portion is formed into a recessed arc-like shape when viewed from thereabove so as to follow the projecting end portion (32c3) of the flat plate portion and includes an abutment portion (33b4) which is brought into abutment with the rotation restricting projection (32c4).