Method for attaching and fixing trestle

Provided is a method for attaching and fixing a trestle (10) which supports an energy conversion device (200) on a roof (110) of a building (100) having eave plates (150). The roof (110) includes at least a roof top ridge (120) and two roof surfaces (130) between which the roof top ridge (120) is disposed. The method comprises an arrangement step and a fixing step. In the arrangement step, the trestle (10), which is formed by linking two grid-shaped structural members (30) by means of a roof top ridge metal fitting (20), is arranged on the roof (110). In the fixing step, metal fittings (80) fixed to the eave plates (150) are linked and fixed to the trestle (10) by means of wires (90). The roof top ridge metal fitting (20) has a predetermined shape so that after the trestle (10) is arranged on the roof (110), the roof top ridge metal fitting (20) can link the grid-shaped structural members (30) in a state where the roof top ridge metal fitting (20) is spaced apart from the roof top ridge (120).