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The form factors of weak decays of $B_s$ mesons to ground state $D_s^{(*)}$mesons as well as to their radial $D_s^{(*)}(2S)$ and orbital $D_{sJ}^{(*)}$excitations are calculated in the framework of the relativistic quark modelbased on the quasipotential approach. All relativistic effects, includingcontributions of intermediate negative-energy states and boosts of the mesonwave functions, are consistently taken into account. As a result the formfactors are determined in the whole kinematical range without additionalphenomenological parametrizations and extrapolations. On this basissemileptonic decay branching fractions are calculated. Two-body nonleptonic$B_s$ decays are considered within the factorization approximation. Theobtained results agree well with available experimental data.

Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model