[en] The β^- decay of ¹⁵⁰Ce having a half-life of 6.05(7) s produced by the thermal-neutron-induced fission of ²³⁵U has been studied using the on-line isotope separator at the Kyoto University Research Reactor. A decay scheme containing 18 excited levels and 55 γ-rays was constructed from γ-ray singles and γ-γ coincidence measurements. Of these, 9 levels and 37 γ-rays were newly placed. The dominant β-feeding observed at the 110 keV level of ¹⁵⁰Pr was found to be an allowed unhindered spin-flip transition. On the basis of the systematics of the neighboring nuclides, the Gallagher-Moszkowski coupling rules, and the selection rules for the β-decay of deformed nuclei, the Nilsson configurations of the ground and 110 keV states in ¹⁵⁰Pr were newly proposed to be π5/2⁺[413]-ν3/2^-[521] and π5/2^-[532]-ν3/2^-[532], respectively. (author)