An illumination device, comprising: an irradiation unit for irradiating light, the irradiation unit including a light emitting element and a plurality of fluorescent bodies (22, 23) excited by the light coming from the light emitting element to radiate light of different wavelengths, the illumination device being characterized in that: the irradiation unit is adapted to irradiate composite light of blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm, the irradiation unit is adapted such that, if the output value of the light in a wavelength range of from 435 nm to 465 nm is assumed to be 100%, the output value of the light having a wavelength of 490 nm falls in a range of from 46% to 56%, the output value of the light having a wavelength of 530 nm falls in a range of from 59% to 77% and the output value of the light having a wavelength of 630 nm falls in a range of from 75% to 98%, the irradiation unit is adapted such that the ratio of the output value of the light having a wavelength of 630 nm to the output value of the light having a wavelength of 530 nm falls in a range of from 73% to 86%, and the light emitting element is an LED element for emitting the blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, the fluorescent bodies (22, 23) including a fluorescent body for radiating the green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and a fluorescent body for radiating the red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm. an irradiation unit for irradiating light, the irradiation unit including a light emitting element and a plurality of fluorescent bodies (22, 23) excited by the light coming from the light emitting element to radiate light of different wavelengths, the illumination device being characterized in that: the irradiation unit is adapted to irradiate composite light of blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm, the irradiation unit is adapted such that, if the output value of the light in a wavelength range of from 435 nm to 465 nm is assumed to be 100%, the output value of the light having a wavelength of 490 nm falls in a range of from 46% to 56%, the output value of the light having a wavelength of 530 nm falls in a range of from 59% to 77% and the output value of the light having a wavelength of 630 nm falls in a range of from 75% to 98%, the irradiation unit is adapted such that the ratio of the output value of the light having a wavelength of 630 nm to the output value of the light having a wavelength of 530 nm falls in a range of from 73% to 86%, and the light emitting element is an LED element for emitting the blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, the fluorescent bodies (22, 23) including a fluorescent body for radiating the green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and a fluorescent body for radiating the red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm. the irradiation unit is adapted to irradiate composite light of blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm, the irradiation unit is adapted such that, if the output value of the light in a wavelength range of from 435 nm to 465 nm is assumed to be 100%, the output value of the light having a wavelength of 490 nm falls in a range of from 46% to 56%, the output value of the light having a wavelength of 530 nm falls in a range of from 59% to 77% and the output value of the light having a wavelength of 630 nm falls in a range of from 75% to 98%, the irradiation unit is adapted such that the ratio of the output value of the light having a wavelength of 630 nm to the output value of the light having a wavelength of 530 nm falls in a range of from 73% to 86%, and the light emitting element is an LED element for emitting the blue light having a half value width of from 20 nm to 40 nm and a peak wavelength in a wavelength range of from 440 nm to 465 nm, the fluorescent bodies (22, 23) including a fluorescent body for radiating the green light having a half value width of from 110 nm to 150 nm and a peak wavelength in a wavelength range of from 545 nm to 555 nm and a fluorescent body for radiating the red light having a half value width of from 80 nm to 110 nm and a peak wavelength in a wavelength range of from 630 nm to 650 nm.