  We have calculated the shear viscosity of pion medium, where propagating pion
has some finite thermal width due to interaction with the low mass resonances,
$\sigma$ and $\rho$. With the help of standard thermal field theoretical
technique, the thermal width of the pion has been calculated from the pion
self-energy diagram for $\pi\sigma$ and $\pi\rho$ loops, where an effective
Lagrangian density has been used for interaction part. We have found a very
small value of shear viscosity by entropy density ratio ($\eta/s$), which is
very close to the KSS bound.
