<；P>；PROBLEM TO BE SOLVED: To provide a light irradiating apparatus for alleviating a sleep disorder or feeling of fatigue such as a jet lag syndrome efficiently in a short time, a program, and a light irradiating method. <；P>；SOLUTION: The light irradiating apparatus comprises an illuminating device 13 emitting light of a prescribed wavelength, a time difference obtaining part 1 for obtaining a time difference from a place of departure to a destination, and an irradiation period of time determining part 2 for determining a period of time for irradiating with the irradiating light from the time difference, and further comprises an irradiation time determining part 4 for determining the time for irradiating with the irradiating light from the time difference, and an irradiation control part 5 for controlling the irradiation of the light of the prescribed wavelength coming out of the illuminating device 13 from the determined irradiating period of time and the irradiating time. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
