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It is shown that, for a nontrivial radiative decay channel of the 17-keVneutrino, the photons would distort the microwave background radiation throughionization of the universe. The constraint on the branching ratio of suchdecays from COBE measurements is found to be more stringent than that fromother considerations. The limit on the branching ratio in terms of the Compton$y$ parameter is $B_\gamma < 1.5 \times 10^{-7} ({\tau_\nu \over 10^{11}sec})^{0.45} ({y \over 10^{-3}})^{1.11} h^{-1}$ for an $\Omega=1, \Omega_b=0.1$universe.Comment: 7 pages. (figures will be sent on request) (To appear in Phys. Rev.  D.

Constraints on radiative decay of the 17-keV neutrino from COBE measurements