A light-emitting element layer 10 includes: an n-type contact layer 11; a first light-emitting layer 12; a tunnel junction layer 13; a second light-emitting layer 14; and a p-type contact layer 15 laminated in this order. The first light-emitting layer 12 and the second light-emitting layer 14 emit light of the same wavelength. The tunnel junction layer 13 includes: a p-type tunnel layer 131 made of AlGaAs containing p-type impurities (C); and an n-type tunnel layer 133 made of GaInP containing n-type impurities (Te). A highly n-type impurities-doped layer 132 having a higher concentration of n-type impurities than the n-type tunnel layer 133 is arranged between the p-type tunnel layer 131 and the n-type tunnel layer 133.