  We investigate the large N limit of the expectation value W(\lambda) of a BPS
Wilson loop in ABJM theory, using an integral expression of the partition
function obtained recently by Kapustin et.al. Certain saddle-point equations
provide the correct perturbative expansion of W(\lambda). The large \lambda
behavior of W(\lambda) is also obtained from the saddle-point equations. The
result is compatible with AdS/CFT correspondence.
