Abstract: A mushroom cultivation method and apparatus concentrate the sunlight through a sunlight concentrating device 17 and introduce the sunlight into a hermetically sealed cultivation chamber through optical fibers 8 at a cultivation term after completion of scrambling of mushroom spawn (operation of budding mushrooms). Mushrooms are irradiated with the introduced sunlight intermittently for a predetermined time. Cultivation environment near natural growing environment can be formed. The intensity of illumination, a wavelength and an irradiating time of the sunlight are adjusted if necessary.