  We investigate the explosive nucleosynthesis during two dimensional
neutrino-driven explosion of ultra-stripped Type Ic supernovae evolved from
1.45 and 1.5 M$_\odot$ CO stars. These supernovae explode with the explosion
energy of $\sim 10^{50}$ erg and release $\sim 0.1$ M$_\odot$ ejecta. The light
trans-iron elements Ga-Zr are produced in the neutrino-irradiated ejecta. The
abundance distribution of these elements has a large uncertainty because of the
uncertainty of the electron fraction of the neutrino-irradiated ejecta. The
yield of the elements will be less than 0.01 M$_\odot$. Ultra-stripped
supernova and core-collapse supernova evolved from a light CO core can be main
sources of the light trans-iron elements. They could also produce neutron-rich
nuclei $^{48}$Ca. The ultra-stripped supernovae eject $^{56}$Ni of $\sim$ 0.006
- 0.01 M$_\odot$. If most of neutrino-irradiated ejecta is proton-rich,
$^{56}$Ni will be produced more abundantly. The light curves of these
supernovae indicate sub-luminous fast decaying explosion with the peak
magnitude of about $-15$ - $-16$. Future observations of ultra-stripped
supernovae could give a constraint to the event rate of a class of neutron star
mergers.
