PURPOSE: To secure an optimum shape for an aircraft without changing the form and the like of wings for enlarging the light receiving area by arranging thin film-shaped solar cells at least on the upper and lower surfaces of wings, and thereby increasing a light receiving range.

CONSTITUTION: In an aircraft provided with a body 10, wings 12, 13, a vertical tail 14, auxiliary wings 15 on the main wings 12, a propeller 16, and wheels, thin film-shaped solar cells 20 are mounted on the upper and lower surfaces of the main wings 12, the rear wing 13, and the auxiliary wings 15, and both surfaces of the vertical tail 14. The reflection ratio of solar light beams above cloud is about 60-90 degrees. In this aircraft, in the case of flying above cloud, power generation is carried out by the color cells 20. A separation part between photo-electric conversion elements is set parallel to the line between the front edge to the rear edge of wing to smooth air stream along the wing to flow to the rear edge without being distrubed by the separation part and to eliminate resistance and the like caused by stepped conditions of the separation part.