  We discuss the Josephson current between two noncentrosymmetric
superconductors. The coexistence of superconducting order parameters between
spin-singlet $\Delta_{\text{S}}$ and helical p-wave spin-triplet
$\Delta_{\text{T}}$ enriches a variety of low-temperature behavior of Josephson
current depending on their relative amplitudes. We will show that
characteristic behaviors of the Josephson current for $\Delta_{\text{S}} >
\Delta_{\text{T}}$ are clearly different from those for $\Delta_{\text{S}} <
\Delta_{\text{T}}$. The topologically protected zero-energy surface bound
states are responsible for the clear difference. We conclude that the Josephson
current well reflects character of the topological surface states and the
pairing symmetry of noncentrosymmetric superconductors.
