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The NEMO-3 results for the double- β decay of¹⁵⁰ Nd to the 0 ⁺₁and 2 ⁺₁excited states of¹⁵⁰ Sm are reported. The data recorded during 5.25 year with 36.6 g of the isotope¹⁵⁰ Nd are used in the analysis. The signal of the2ν β β transition to the 0 ⁺₁excited state is detected with a statistical significance exceeding 5 σ . The half-life is measured to beT_(1/2)^(2ν β β)(0⁺₁) = \\left[ 1.11 ^(+0.19)_(-0.14) \\left( \\hbox stat\\right) ^(+0.17)_(-0.15) \\left( \\hbox syst\\right) \\right] × 10²⁰  year, which is the most precise value that has been measured to date. 90% confidence-level limits are set for the other decay modes. For the2ν β β decay to the 2 ⁺₁level the limit isT^(2ν β β)_(1/2)(2⁺₁) > 2.42 × 10²⁰ \\hbox year . The limits on the0ν β β decay to the 0 ⁺₁and 2 ⁺₁levels of¹⁵⁰ Sm are significantly improved toT_(1/2)^(0ν β β)(0⁺₁) > 1.36 × 10²² \\hbox yearandT_(1/2)^(0ν β β)(2⁺₁) > 1.26 × 10²² \\hbox year .