To provide a frame structure of an easy building having high strength while greatly decreasing construction cost.

This frame structure of an easy building is composed of arch materials comprising a plurality of units having as 1 unit, a frame unit made by connecting a plurality of curved members with ridgepole part joints in an X shape from a plane view and an arch shape from a frontal view, ridgepole materials connected to the arch materials on the top of the arch material with the ridgepole part joints, and girder materials connected to the arch materials on the shoulder part of the arch material with shoulder joints. The arch material is arranged so as to intersect the curved members each other of the frame units adjacent to each other between the ridgepole material and the girder material, and the lower end thereof is inserted into the ground.

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