We give in the two first chapters some fundamental properties of the automorphism group of bounded domains and Kobayashi hyperbolic complex manifolds. We emphasize the role of the Poincaré, Carathéodory and Kobayashi metrics. The subject of the third chapter is plurisubharmonicity and pseudoconvexity. It is used to extend in the last chapter some previous results to non hyperbolic domains and proper holomorphic maps.