  We investigate the temperature dependence of the lower critical field
$H_{c1}(T)$, the field at which vortices penetrate into the sample, of a
high-quality fluorine-doped NdFeAsO single crystal under static magnetic fields
$H$ parallel to the $c$-axis. The temperature dependence of the first vortex
penetration field has been experimentally obtained and pronounced changes of
the $H_{c1}$(T) curvature are observed, which is attributed to the multiband
superconductivity. Using a two-band model with $s$-wave-like gaps, the
temperature-dependence of the lower critical field $H_{c1}(T)$ can be well
described. These observations clearly show that the superconducting energy gap
in fluorine-doped NdFeAsO is nodeless. The values of the penetration depth at
$T$ = 0\,K have been determined and confirm that the pnictide superconductors
obey an Uemura-style relationship between $T_{c}$ and $\lambda_{ab}(0)^{-2}$
