Rotating Black Hole, Twistor-String and Spinning Particle

We discuss basic features of the model of spinning particle based on the Kerr solution. It contains a very nontrivial {\it real} stringy structure consisting of the Kerr circular string and an axial stringy system. We consider also the complex and twistorial structures of the Kerr geometry and show that there is a {\it complex} twistor-string built of the complex N=2 chiral string with a twistorial $(x,\theta )$ structure. By imbedding into the real Minkowski ${\mathbf{M}}^{\mathbf{4}}$, the N=2 supersymmetry is partially broken and string acquires the open ends. Orientifolding this string, we identify the chiral and antichiral structures. Target space of this string is equivalent to the Witten’s `diagonal’ of the $\mathbf{C}{\mathbf{P}}^{\mathbf{3}}\times \mathbf{C}{\mathbf{P}}^{\ast \mathbf{3}}\mathbf{.}$