A method of manufacturing a solar cell panel, includes steps (a) to (e). The step (a) is a step of forming a solar cell module by laminating solar cell films on a transparency substrate. The step (b) is a step of performing an inspection of electric power generation on the solar cell module. The step (c) is a step of forming a solar cell panel by executing a panel formation on the solar cell module. The step (d) is a step of cleaning a light incidence surface of the solar cell panel. The step (e) is a step of performing an inspection of electric power generation on the solar cell panel. The step (d) is executed immediately before the step (e).