OPENING STRUCTURE

PROBLEM TO BE SOLVED: To provide an opening structure capable of being easily opened to allow a worker to get through an opening onto a roof for checking various systems or to ventilate, preventing rainwater infiltration from a periphery of the opening and being applied as a daylighting structure.SOLUTION: This invention provides an exterior structure to form an opening 13 on a laying surface of an exterior material 3 by laying the exterior material 3 on a building frame 6 through a holding member 4. The exterior structure forms a first space 33 between an upright part 32 of the exterior material 3 and the holding member 4 as well as a second space 34 between a face plate 31 of the exterior material 3 and a top face of the building frame 6. A lower layer material 1 having a bottom 11, a standing part 12 and the opening 13 is placed in the structure by placing the standing part 12 in the first space 33 and the bottom 11 in the second space 34. A coating exterior material 2 is placed on the lower layer material 1 through slide mechanisms (14, 24) via the lower layer material 1. The coating exterior material 2 can be moved into a storage space 15 between a reverse surface of the exterior material 3 and the lower layer material 1 by sliding the coating exterior material 2 from the state in which the opening 13 of the lower layer material 1 is covered.