BUILDING

To provide a building that makes it possible to partially enlarge a ceiling height of a building floor by securing a function of transmitting horizontal force of beams.SOLUTION: A building 10 includes: an upper structure 12 at which a core part 18 is provided; a plurality of outer peripheral columns 20 provided at an outer periphery of the upper structure 12; first floors 22 that are provided at the upper structure 12 and comprise a first X direction beam 38 extending in one plane direction to connect the core part 18 with an outer peripheral column 20; and second floors 24 that are provided at the upper structure 12 and arranged so as to be alternated with the first floors 22 and comprise a second X direction beam 44 having a height shorter than that of the first X direction beam 38 and extending in the one plane direction to connect the core part 18 with the outer peripheral column 20.SELECTED DRAWING: Figure 1 【課題】梁の水平力の伝達機能を確保することで、建物階の天井高を部分的に高くすることができる建物を提供する。【解決手段】建物１０は、コア部１８が設けられた上部構造体１２と、上部構造体１２の外周部に設けられた複数の外周柱２０と、上部構造体１２に設けられ、平面一方向へ延びてコア部１８と外周柱２０とを連結する第１Ｘ方向梁３８を備える第１の階２２と、上部構造体１２に設けられるとともに、第１の階２２と交互に配置され、第１Ｘ方向梁３８より梁成が小さく、平面一方向へ延びてコア部１８と外周柱２０とを連結する第２Ｘ方向梁４４を備える第２の階２４と、を有する。【選択図】図１