Nonlinear Raman scattering has been widely used as one of the methods for label-free molecular imaging in recent years. Among them, coherent anti-Stokes Raman scattering (CARS) has the capability of obtaining the broad spectral bandwidth of >3000 cm^-1, which is the broadest spectral bandwidth ever reported. In this talk, I will introduce our development of CARS microscopy and its applications to living cell imaging.