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Molecular images of an organic adsorbate on silver halide have been observed using AFM (atomic force microscopy). Sensitizing-dyes and restrainers adsorbed on single grain films of AgBr cubic crystals were examined. In the case of 1-ethyl-2-[(1-ethyl-2(1H)-quinolinylidene) methyl] quinolinium bromide (2, 2'-cyanine), a molecular image was clearly observed. It was revealed that 2, 2'-cyanine had a two-dimensional arrangement of a = 0.8 (nm), b = 1.6 (nm), and beta = 118~130 (deg), with approximately 10 degrees of slip angle from the AgBr <010> direction. Based on this arrangement, adsorption model was proposed and discussed.