lower part of a fence component therebetween is pivotally mounted on said axis it can be modified as shown in fig9 such that a hole 15 is bored through the middle of the cut out portion provided on the lower portion of a fence component into which a pivot pin 24 a 24 provided at the apex of an isosceles triangle stay is slid such modification naturally belongs to the technical scope of the present invention also in the above mentioned embodiment though it is shown that the respective stays are pivotally mounted onto the lower part of the respective fence components if desired it does not matter whether the stays are mounted onto only one fence component or some of those fence components this modification also belongs to the technical scope of the present invention further in the above mentioned embodiment though it is exemplified that the adjacent components of the portable fence are connected to each other by means of bi axial hinges they can be arranged such that they are alternately connected to each other by means of a common hinge or some pieces of them are unremovedly hinged to each other as one unit in which case its commercialization is realized by adding further units as required such modification also belongs to the technical.