Review of double beta decay experiments

The brief review of current experiments on search and studying of double beta decay processes is done. Best present limits on $\langle m_{\nu} \rangle$ and $\langle g_{ee} \rangle$ are presented. Prospects of search for neutrinoless double beta decay in new experiments with sensitivity to $\langle m_{\nu}\rangle$ at the level of $\sim$ 0.01-0.1 eV are discussed.