Problem to be Solved The present invention is made in view of the above-described circumstances. An object of the present invention is to provide a sunlight collecting system achieving suppression of power generation cost with the receiver which enables suppressing the manufacturing, transportation and construction costs, facilitating recovery work in the case of occurrence of a failure, and promptly recovering a heating medium circulating inside the receiver in an emergency.Means for Solving the Problem A sunlight collecting system in which sunlight is reflected by a plurality of heliostats onto a heat receiving portion having a heating medium circulated therein and then energy is drawn from the heating medium, characterized in that the sunlight collecting system is configured such that: the heat receiving portion is formed by assembling a plurality of modules, each of the modules includes an upper header, a lower header, and a plurality of heat receiving tubes connecting the two headers, and the heating medium circulates in the modules.