Expansion device of panels

An expansion device of panels comprising:

• a first constituent member constructed by a plurality of panels;
• and
• a second constituent member constructed by a plurality of panels that are different from the plurality of panels constructing the first constituent member, wherein
• adjacent panels of the first constituent member partly overlap each other, a first link member that can be expanded and contracted is connected to the first constituent member, and the first constituent member can be expanded and contracted by expansion and contraction of the first link member,
• adjacent panels of the second constituent member partly overlap each other, a second link member that can be expanded and contracted is connected to the second constituent member, and the second constituent member can be expanded and contracted by expansion and contraction of the second link member,
• the first constituent member and the second constituent member can relatively be rotated around rotation axes provided in the expansion and contraction direction of the link members and also can removably be connected,
• the first link member and the second link member are connected to both ends of connecting link arm members via a free joint respectively, and
• the first link member and the second link member can be separated from each other.