Disclosed is a vaccine which has a high therapeutic effect on mycoplasma infection and is highly safe. For the purpose of developing effective therapeutic methods for mycoplasma infection, mycoplasma-mimic particles which are effective as a vaccine for mycoplasma infection are provided, and also provided are bacterium-mimic particles including common bacteria. Bacterium-mimic particles such as mycoplasma-mimic particles can be provided by producing liposome particles in which a lipid antigen specific to a pathogenic bacterium such as mycoplasma is contained as a liposome-constituting lipid component. The administration of the mycoplasma-mimic particles enables the induction of a potent immunological activity in living bodies. The mycoplasma-mimic particles can be used as an excellent vaccine for the prevention or treatment of mycoplasma infection.