We investigate the three-body interaction between adsorbates via conduction electron of the substrate through the nonlinear electric susceptibility. The second-order nonlinear susceptibility has a step-function-like singularity as a function of the wavevectors. Due to this singularity, oscillatory behavior is expected in the three-body interaction. We calculate the three-body interaction numerically and examine the oscillatory behavior, which is not dominated by a single wavevector component.