To solve a problem with a conventional product, wherein the product has shortcomings in each system hindering its prevalence, that is, an optical fiber system low in daylighting efficiency tending to get large-scale to cover the defect and get costly, a solar aspect tracking system in a reflecting mirror system getting too costly to pay, other systems involving problems such as a low daylighting rate, a high installation cost or the like, so that there have been no universal products without problems and an energy-saving device as it is has been too costly and has never prevailed.

Manufacturing cost of a sunlight lighting device has been reduced by doing away with a solar aspect tracking device to simplify a structure and reduce the number of necessary components.