PROBLEM TO BE SOLVED: To equip a skylight having high ventilation performance while preventing a decrease in daylighting. SOLUTION: An agricultural house 1 is provided with gassho beams 21 and 21 to be joined at the upper ends, and a bracket member 23 extending outward from the upper part of a butt plate 22 integrated with the upper end joints of the gassho beams and extending upward. On the other hand, the outer fitting member 31 that can be externally fitted from above is rotatably attached, and the upper rail 33 of the skylight is joined to the outer fitting member 31, and the lower rail 35 of the skylight is attached to the upper surface of the gassho beam. Attach the skylight receiving member 25 to receive. The crosspieces 33 to 35 and the skylight receiving member 25 constituting the frame of the skylight are used so that the long sides of the steel square pipe having a rectangular cross section are laid on their sides. The upper end of the arch pipe forming the roof surface including the skylight is fastened to the skylight receiving member 25. [Selection diagram] Fig. 3【課題】採光性の低下を防止しつつ換気性能の高い天窓を装備する。【解決手段】農業用ハウス１は、上端で接合される合掌梁２１，２１を備え、合掌梁上端接合部と一体化されて上方に伸びる突き合わせ板２２の上部から外側に向かって伸びるブラケット部材２３に対して、上方から外嵌め可能な外嵌部材３１を回動可能に取り付けると共に、この外嵌部材３１に対して天窓の上桟３３を接合し、合掌梁上面に、天窓の下桟３５を受け止める天窓受け部材２５取り付ける。天窓の枠体を構成する桟３３～３５及び天窓受け部材２５を長方形断面の鋼製角パイプの長辺が横倒しとなる様に用いる。天窓を備える屋根面を構成するアーチパイプの上端を天窓受け部材２５までで留める。【選択図】 図３
