The present invention provides an immunomodulating agent and a therapeutic agent for a immune disease, which comprise a lipid vesicle encapsulating a drug capable of suppressing or damaging an immunocyte that expresses or binds to an antibody, the lipid vesicle having an antigen for the antibody bound to the outer surface thereof. Hence, there is provided means for effectively treating an immune disease such as an allergic diseases or an autoimmune disease.