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We reexamine relic abundance of a singlet fermion as a CDM candidate, whichcontributes to the neutrino mass generation through radiative seesaw mechanism.We search solutions for Yukawa couplings and the mass spectrum of relevantfields to explain neutrino oscillation data. For such solutions, we show thatan abundance of a lightest singlet fermion can be consistent with WMAP datawithout conflicting with both bounds of $\mu\to e\gamma$ and $\tau\to\mu\gamma$. This reconciliation does not need any modification of the originalradiative seesaw model other than by specifying flavor structure of Yukawacouplings and taking account of coannihilation effects.

Reconciliation of CDM abundance and $\mu\to e\gamma$ in a radiative seesaw model