  We present an update of the finite temperature phase structure analysis for
three flavor QCD. In the study the Iwasaki gauge action and non-perturvatively
O($a$) improved Wilson-Clover fermion action are employed. We discuss finite
size scaling analysis including mixings of magnetization-like and energy-like
observables. Preliminary results are shown of the continuum limit of the
critical point using newly generated data at Nt=8,10, including estimates of
the critical pseudo-scalar meson mass and critical temperature.
