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 $N_{¥rm t}=8,10$, including estimates of the critical pseudo-scalar meson mass and critical temperature.
