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Fine bubbles are attracting social attention due to their many physical characteristics. However, the stability of fine bubbles remains unclear. Controlling its stability leads to the addition of new functions to the fine bubbles. It is important to elucidate the stabilization mechanism of the fine bubbles. We studied the stabilization of fine bubbles by molecular film covering that utilized molecular adsorption characteristics of the bubble surface. The molecular film was formed by two types of molecules. One was dialkylbipyridinium which was a positively charged organic molecule with hydrophobic groups, and the other was polystyrene sulfonate which was a negatively charged polymer. These two types of molecules interacted electrostatically to form a molecular film called an ion complex film on the surface of the bubble that was insoluble in water. The fine bubbles covered with the ion complex film were observed as a spherical structure by a digital microscope. Although the number decreased, a spherical structure was observed in the solution left for about one year. [ABSTRACT FROM AUTHOR]