A therapeutic agent for allergy that in the method of allergy treatment by allergen administration (hyposensitization therapy), realizes enhancement of therapeutic efficacy and improvement in side effects, such as anaphylaxis. There is provided a therapeutic agent for allergy containing a liposome having on its surface an oligosaccharide composed of 2 to 11 sugar residues and capable of binding to lectin from antigen presenting cells, characterized in that an allergen is enclosed in the liposome.