  We investigate nucleosynthesis inside both a gamma-ray burst accretion disk
and a wind launched from an inner region of the disk using one-dimensional
models of the disk and wind and a nuclear reaction network. Far from a central
black hole, the composition of accreting gas is taken to be that of an O-rich
layer of a massive star before core collapse. We find that the disk consists of
five layers characterized by dominant elements: O16, Si28, Fe54 (and Ni56),
He4, and nucleons, and the individual layers shift inward with keeping the
overall profiles of compositions as the accretion rate decreases. Ni56 are
abundantly ejected through the wind from the inner region of the disk with the
electron fraction \simeq 0.5. In addition to iron group, elements heavier than
Cu, in particular Cu63 and Zn64, are massively produced through the wind.
Various neutron-rich nuclei can be also produced in the wind from neutron-rich
regions of the disk, though the estimated yields have large uncertainties.
