A trestle includes a base, a slide bracket, a fixing unit, a first fastener, and a second fastener. The fixing unit is installed on the slide bracket and fixes a solar panel that is mounted on a surface of a roof surface. A mounting surface on which the solar panel is mounted is formed on a receiving member of the fixing unit. A fixing unit main body of the fixing unit is formed capable of holding down and fixing the solar panel to the mounting surface by the second fastener, and is fixed to the receiving member. The first fastener is attached such that the fixing between the slide bracket and the fixing unit can be released while maintaining the fixing between the receiving member and the fixing unit main body by the second fastener.