PROBLEM TO BE SOLVED: To provide a rooftop greening structure capable of greening a desired area at a desired position of a slope roof. SOLUTION: The rooftop greening structure 10 for greening the desired area at the desired position of the slope roof 12 of a building 11 has clamps 14, 14 arranged on roof materials 13 constituting the slope roof 12 at a prescribed interval so as to face to each other, and vegetation mat-fixing tools 16 fixed to the clamps 14 and for fixing vegetation mats 15. The rooftop greening having the desired size can be achieved at the desired position of the slope roof by the rooftop greening structure 10. COPYRIGHT: (C)2006,JPO&NCIPI