Pyrrole twas polymerized electrochemically using various electrolytes. The morphology of the polypyrrole film surfaces in contact with the solution always shows aggregation of spheres regardless of the electrolyte used. However, the morphology of the surface in contact with the Pt electrode shorts difference depending on the electrolytes used. The electrode side of the polymer formed with sodium lauryl sulfate as the electrolyte is completely flat while that formed with tetra-n-butyl ammonium perchlorate or tetra-n-butyl ammonium tetra fluoroborate as the electrolyte has many pits. Chemical soaking of the polypyrrole in THF or electrochemical reduction of it causes no change in the morphology. Polypyrrole may be imbedded partially in polyvinyl chloride which covered the Pt electrode only in the early stage of polymerization but a prolonged polymerization seems to tear out the polyvinyl chloride film.