  One of the most promising methods to search for axions is a
light-shining-through-walls (LSW) experiment. In this work, we discuss the
possibility of performing an LSW experiment at the ILC experiment, where photon
beams are generated for positron production. The photon beam is energetic and
intense; the energy is of order MeV and the number of photons is about
$10^{24}$ per year. Due to the high energy and intensity, this LSW experiment
can reveal the parameter region of the axion unexplored by previous
ground-based experiments.
