To provide a plant-culturing system capable of increasing crop yields or the culturing amount by effectively utilizing a culturing area for culturing plants.

The plant-culturing system G is mainly composed of a plant culturing house 1 having a three-story structure in which a plant-culturing space P for culturing plants 2 is formed in the interior, a belt conveyer 5 for transferring the plants 2 in a horizontal direction in the plant-culturing space P and an elevator 8 for transferring the plants 2 in a vertical direction. In the plant-culturing house 1, most of a roof and a south wall are formed by a transparent glass 7 and a plurality of plants 2 can uniformly be irradiated with a solar light S in a third floor part T.