NOVELTY - The sheet (101) has a first surface comprising convex surfaces and a first flat surface in a region between the convex surfaces. A second surface comprises other convex surfaces and a second flat surface in a region between the latter convex surfaces, where each of the former convex surfaces and the second flat surface overlap with each other and each of the latter convex surfaces and the first flat surface overlap with each other. A first lens array is provided on a front side. A second lens array is provided on a back side.    USE - Lens sheet for use in a photoelectric conversion module (claimed) used in a solar power generation system e.g. tracking-type solar power generation system and focusing-and tracking-type solar power generation system.    ADVANTAGE - The sheet creates a region that is not irradiated with light when the light is incident on the sheet from above, thus enabling effective utilization of light incident on the sheet without loss. The sheet efficiently irradiates a photoelectric conversion element with the light, thus providing a high-efficiency photoelectric conversion module. The sheet is provided with prismatic lens regions on sides such that a larger region of the photoelectric conversion element can be irradiated with the light having same intensity as the light incident on the lens regions on one of the sides, so that photoelectric conversion efficiency can be improved when a larger region of the photoelectric conversion element is uniformly irradiated with the light, thus allowing the photoelectric conversion module to have high efficiency.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a photoelectric conversion module comprising a photoelectric conversion element.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a lens sheet and a photoelectric conversion module.    Lens sheet (101)    Photoelectric conversion element (200)    Grid electrodes (201)    Photoelectric conversion module (202)