  We report a detailed investigation on the lower critical field $H_{c1}$ of
the superconducting Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ (FeAs-122) single crystals.
A pronounced kink is observed on the $H_{c1}(T)$ curve, which is attributed to
the existence of two superconducting gaps. By fitting the data $H_{c1}(T)$ to
the two-gap BCS model in full temperature region, a small gap of
$\Delta_a(0)=2.0\pm 0.3$ meV and a large gap of $\Delta_b(0)=8.9\pm 0.4$ meV
are obtained. The in-plane penetration depth $\lambda_{ab}(0)$ is estimated to
be 105 nm corresponding to a rather large superfluid density, which points to
the breakdown of the Uemura plot in FeAs-122 superconductors.
