  Birth of the brane world is studied using the Hamiltonian approach. It is
shown that an inflating brane world can be created from nothing. The wave
function of the universe obtained from the Wheeler de-Witt equation and the
time-dependent Schr$\ddot{o}$dinger equation for quantized scalar fields on the
brane are the same as in the conventional 4-dimensional quantum cosmology if
the bulk is exactly the Anti-de Sitter spacetime. The effect of the massive
objects in the bulk is also discussed. This analysis tells us the presence of
the extra dimension imprints a nontrivial effect on the quantum cosmology of
the brane world. This fact is important for the analysis of the quantum
fluctuations in the inflationary scenario of the brane world.
