  We show that the BMN operators arise from the expansion of the Wilson loop in
four-dimensional N=4 super Yang-Mills theory. The Wilson loop we consider is
obtained from ``dimensional reduction'' of ten-dimensional N=1 super Yang-Mills
theory, and it contains six scalar fields as well as the gauge field. We expand
the Wilson loop twice. First we expand it in powers of the fluctuations around
a BPS loop configuration. Then we further expand each term in the result of the
first step in powers of the scalar field Z associated with the BPS
configuration. We find that each operator in this expansion with large number
of Z is the BMN operator. The number of fluctuations corresponds to the number
of impurities, and the phase factor of each BMN operator is supplied correctly.
We have to impose the BPS condition on the loop for obtaining the complete form
of the BMN operators including the correction terms with \bar Z. Our
observation suggests the correspondence between the Wilson loop and the string
field.
