To provide an installation structure of a solar cell panel which allows for facilitation of various works, e.g., maintenance work, even when a large-scale photovoltaic power generation system is formed, and to provide a photovoltaic power generation panel installation frame.

By means of a plurality of solar cell panel support frames 3, solar cell panels 4 are arranged in columns or in a plurality of rows with a planar expanse. At least one set of solar cell panel support frames 3 are arranged at intervals, and the solar cell panels 4 are attached, respectively, to one panel fixing part 14 out of the set of solar cell panel support frames 3, and to the other panel fixing part. In a state where the solar cell panels 4 are attached to the solar cell panel support frames 3, at least a part of a step board 60 is supported by a step board support 13, and the step board support 13 is provided so that the step board 60 and the solar cell panels 4 are in contact without a gap.