An LED light source for plant cultivation, including a light emitting device including: at least one first LED chip (2, 52) which emits first short-wavelength-region light corresponding to a first peak wavelength, which is in a relatively short wavelength region, of a plurality of peak wavelengths of light absorbed by a plant or an alga which requires the light for photosynthesis to grow; and a phosphor-containing sealing resin which covers said at least one first LED chip, a phosphor contained in the phosphor-containing sealing resin emitting long-wavelength-region light upon absorbing the first short-wavelength-region light emitted from said at least one first LED chip (2, 52), the long-wavelength-region light corresponding to a peak wavelength, which is in a longer wavelength region than the first peak wavelength, of the plurality of peak wavelengths, characterized in that, the LED light source comprises at least two blue LED chips (2,52) each having an emission peak corresponding to a blue light region absorption peak of chlorophyll; at least one red phosphor which emits, upon receiving excitation light from said at least two blue LED chips (2,52), light having a peak wavelength in a range from 620 nm to 700 nm so as to correspond to a red light region absorption peak of chlorophyll; and a resin layer in which the at least one red phosphor is dispersed and which covers said at least two blue LED chips (2,52), said at least two blue LED chips (2,52) being constituted by: at least one blue LED chip for chlorophyll a which blue LED chip has an emission peak in a range from 400 nm to 450 nm so as to correspond to a blue light region absorption peak of the chlorophyll a; and at least one blue LED chip for chlorophyll b which blue LED chip has an emission peak in a range from 450 nm to 480 nm so as to correspond to a blue light region absorption peak of the chlorophyll b. at least one first LED chip (2, 52) which emits first short-wavelength-region light corresponding to a first peak wavelength, which is in a relatively short wavelength region, of a plurality of peak wavelengths of light absorbed by a plant or an alga which requires the light for photosynthesis to grow; and a phosphor-containing sealing resin which covers said at least one first LED chip, a phosphor contained in the phosphor-containing sealing resin emitting long-wavelength-region light upon absorbing the first short-wavelength-region light emitted from said at least one first LED chip (2, 52), the long-wavelength-region light corresponding to a peak wavelength, which is in a longer wavelength region than the first peak wavelength, of the plurality of peak wavelengths, characterized in that, the LED light source comprises at least two blue LED chips (2,52) each having an emission peak corresponding to a blue light region absorption peak of chlorophyll; at least one red phosphor which emits, upon receiving excitation light from said at least two blue LED chips (2,52), light having a peak wavelength in a range from 620 nm to 700 nm so as to correspond to a red light region absorption peak of chlorophyll; and a resin layer in which the at least one red phosphor is dispersed and which covers said at least two blue LED chips (2,52), at least two blue LED chips (2,52) each having an emission peak corresponding to a blue light region absorption peak of chlorophyll; at least one red phosphor which emits, upon receiving excitation light from said at least two blue LED chips (2,52), light having a peak wavelength in a range from 620 nm to 700 nm so as to correspond to a red light region absorption peak of chlorophyll; and a resin layer in which the at least one red phosphor is dispersed and which covers said at least two blue LED chips (2,52), said at least two blue LED chips (2,52) being constituted by: at least one blue LED chip for chlorophyll a which blue LED chip has an emission peak in a range from 400 nm to 450 nm so as to correspond to a blue light region absorption peak of the chlorophyll a; and at least one blue LED chip for chlorophyll b which blue LED chip has an emission peak in a range from 450 nm to 480 nm so as to correspond to a blue light region absorption peak of the chlorophyll b. at least one blue LED chip for chlorophyll a which blue LED chip has an emission peak in a range from 400 nm to 450 nm so as to correspond to a blue light region absorption peak of the chlorophyll a; and at least one blue LED chip for chlorophyll b which blue LED chip has an emission peak in a range from 450 nm to 480 nm so as to correspond to a blue light region absorption peak of the chlorophyll b.