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The QCD phase diagram is studied in the lattice QCD simulation with theimaginary chemical potential approach. We employ a clover-improved Wilsonfermion action of two-flavors and a renormalization-group improved gaugeaction, and perform the simulation at an intermediate quark mass on a$8^3\times 4$ lattice. The QCD phase diagram in the imaginary chemicalpotential $\mu_I$ region is investigated by performing the simulation for morethan 150 points on the $(\beta,\mu_I)$ plane. We find that the Roberge-Weissphase transition at $\mu_I/T=\pi/3$ is first order and its endpoint is secondorder, which are identified by the phase of the Polyakov loop. We determine thepseudo-critical line from the susceptibility of the Polyakov loop modulus. Wefind a clear deviation from a linear dependence of the pseudo-critical line on$\mu_I^2$.

Imaginary Chemical Potential Approach for the Pseudo-Critical Line in the QCD Phase Diagram with Clover-Improved Wilson Fermions