Resonance Raman(RR) spectra have been measured for various metallo-trans-octaethylchlorin (M(OEC)) to elucidate the characteristic feature of metallochlorin RR spectra and to provide further insight into chlorin chemistry. The RR spectral characteristics of metallochlorins in comparison with metalloporphyrins explored in this paper are summarized as follows: (i) polarization properties of RR bands of M(OEC) can be interpreted by assuming that M(OEC) has an effective symmetry of C22v; (ii) The frequencies of bands in the 1700'1450 cm-1 region of M(OEC) depend on the metal species coordinated and straight lines are obtained between the frequencies and the transition energy of the Q band; (iii) vibrational properties of ν19 and ν3 modes are considerably different between M(OEP) and M(OEC); (iv)most of the RR bands in the 1400-1000 cm-1 region of M(OEC) show pronounced intensity enhancement upon excitation near the Q band, suggesting that electronic excitation in the Q band region involves appreciable stretch of the CαCβ and CαN bonds for M(OEC).