To provide a dome structure, which is constructed easily, in which a passage or the like is ensured while treating snow sliding from a roof without installing a snow melting pond or a snow piling land, and which can utilize a space section under the roof covered with the roof maximally.

In the dome structure 10, the dome structure 10 has the dome-shaped roof 2 and square-shaped supporting structures 3 supporting the outer peripheral edge section of the roof 2 and having an annular shape in a plan view, and the space section 5 under the roof is formed on the inside. In the dome structure 10, the supporting structures 3 support the roof 2 by their inner-peripheral edge sections, and have deck slabs 31 projected to the outside of the space section 5 and supporting sections 32 receiving the vertical force of the roof 2 while supporting the horizontal sections 31. In the dome structure 10, the deck slabs 31 receive the thrust S of the roof 2.