To solve the problem that, in the prior arts, there is no installation structure in which a plurality of solar panels provided in parallel are synchronously rotated for the same amount in the same direction by one drive source and directions of light receiving planes of the plurality of solar panels can be aligned.

An installation structure comprises a fixed shaft which is erected on a fixed base, a rotary tube which covers the fixed shaft and rotates in a direction parallel with the fixed base, and a solar panel which is fixed on a top closed face of the rotary tube so as to freely fall down or tilt. A plurality of solar panels including such mechanisms are provided in parallel at suitable intervals. Endless drive means is wound around and connected to the rotary tube. The drive means is made movable by a drive source and the plurality of solar panels are synchronously rotated while being connected in a direction parallel with the fixed base.