An organic electroluminescent element comprising: a first electrode having optical transparency; a second electrode; and a plurality of light-emitting layers disposed between the first and second electrodes, wherein the plurality of light-emitting layers stacked between the first and second electrodes each emit light having a different peak wavelength; wherein each of the light-emitting layers (41, 42, 43) is disposed separately from the second electrode at such a position that optical resonance is generated by reflected light emitted from a predetermined light-emitting layer (41, 42, 43) toward the second electrode and reflected by the second electrode to return, and light emitted from the predetermined light-emitting layer toward the first electrode; and wherein no layer different from the light-emitting layer (41, 42, 43) is provided between the light-emitting layers (41, 42, 43); wherein for each of the light-emitting layers (41, 42, 43), a distance between a light-emitting center portion of a k-th light-emitting layer (41, 42, 43), "k" representing a natural number, counted from a side of the first electrode among the plurality of light-emitting layers and a portion of the second electrode which reflects light falls within a range of 0.9 to 1.1 times a resonance distance d k represented by the following equation: d k = m k · λ k 4 ⁢ n wherein λ k represents a peak wavelength of light emitted from the k-th light emitting layer, n represents an average refractive index of a member placed between the k-th light-emitting layer (41, 42, 43) and the second electrode, and m k is a positive odd number, and wherein the first electrode is an anode and the second electrode is a cathode, characterised in that the respective light-emitting layers (41, 42, 43) are disposed from the first electrode to the second electrode in an order of increasing HOMO and LUMO. a first electrode having optical transparency; a second electrode; and a plurality of light-emitting layers disposed between the first and second electrodes, wherein the plurality of light-emitting layers stacked between the first and second electrodes each emit light having a different peak wavelength; wherein each of the light-emitting layers (41, 42, 43) is disposed separately from the second electrode at such a position that optical resonance is generated by reflected light emitted from a predetermined light-emitting layer (41, 42, 43) toward the second electrode and reflected by the second electrode to return, and light emitted from the predetermined light-emitting layer toward the first electrode; and wherein no layer different from the light-emitting layer (41, 42, 43) is provided between the light-emitting layers (41, 42, 43); wherein for each of the light-emitting layers (41, 42, 43), a distance between a light-emitting center portion of a k-th light-emitting layer (41, 42, 43), "k" representing a natural number, counted from a side of the first electrode among the plurality of light-emitting layers and a portion of the second electrode which reflects light falls within a range of 0.9 to 1.1 times a resonance distance d k represented by the following equation: d k = m k · λ k 4 ⁢ n wherein λ k represents a peak wavelength of light emitted from the k-th light emitting layer, n represents an average refractive index of a member placed between the k-th light-emitting layer (41, 42, 43) and the second electrode, and m k is a positive odd number, and wherein the first electrode is an anode and the second electrode is a cathode, characterised in that the respective light-emitting layers (41, 42, 43) are disposed from the first electrode to the second electrode in an order of increasing HOMO and LUMO.