PROBLEM TO BE SOLVED: To provide a structure firmly and easily installing a house cultivation arch-like aggregate in a rooftop greening structure.SOLUTION: This rooftop greening structure includes pressingly fixing each of support stands 24 in each of support stand line groups 24A to a rooftop slab surface through a greening support layer 6, using a fastener which pierces into the greening support layer 6, and steps over between each of the support stands 24 and the rooftop slab surface 2, and installing a holding member 36 for holding a house cultivation arch-like aggregate 50 each on the upper end surface of each of the support stands 24 in each of the support stand line groups 24A. As a result of this, the support stand 24 which has stiffness higher than the greening support layer 6, and is firmly fixed to the rooftop slab surface 2 through the greening support layer 6 is used for holding the end part of the arch-like aggregate 50. The holding member 36 for holding the end part of the arch-like aggregate 50 is installed on the upper end surface of the support stand 24 so as to suppress the holding member 36 from burying in soil and increase the visibility.【課題】屋上緑化構造において、ハウス栽培用アーチ状骨材を強固且つ容易に据え付ける構造を提供する。【解決手段】各支持台列群２４Ａにおける各支持台２４を、緑化支援層６を貫通して各支持台２４と屋上スラブ面２との間を跨ぐ留め具を用いることにより、緑化支援層６を介して該屋上スラブ面に押圧固定し、その各支持台列群２４Ａにおける各支持台２４の上端面に、ハウス栽培用アーチ状骨材５０を保持するための保持部材３６をそれぞれ設ける。これにより、アーチ状骨材５０の端部を保持するものとして、緑化支援層６よりも剛性が高く且つ屋上スラブ面２に緑化支援層６を介してしっかりと固定された支持台２４が用いられるようにする。また、アーチ状骨材５０の端部を保持する保持部材３６を支持台２４の上端面に設けることにより、土壌に埋もれることを抑制し、その保持部材３６の視認性を高める。【選択図】図１
