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We present preliminary results on the $\rho$ meson decay width from $N_f=2+1$full QCD configurations generated by PACS-CS Collaboration. The decay width isestimated from the $P$-wave scattering phase shift for the isospin $I=1$two-pion system. The finite size formula presented by L\"uscher in the centerof mass frame and its extension to non-zero total momentum frame by Rummukainenand Gottlieb are employed for the calculations of the phase shift. Ourcalculations are carried out at $m_\pi=410\ {\rm MeV}$ ($m_\pi/m_\rho=0.46$)and $a=0.091\ {\rm fm}$ on a $32^3\times 64$ ($La=2.9 {\rm fm}$) lattice.

Calculation of $\rho$ meson decay width from the PACS-CS configurations