The present invention has an immunopotentiating effect on any target oligosaccharide chain antigen, particularly an oligosaccharide chain antigen contained in an N-linked sugar chain of a glycoprotein derived from a mammal. Immunity-inducing agent comprising as active ingredient a glycolipid represented by the general formula (2) containing a target oligosaccharide chain antigen R or a salt thereof, which can provide a monoclonal antibody having high specificity and affinity, and immunity using the same Provide a guidance method. General formula (2) R—Z—Y—CH (NH—CO— (CH 2) n 1 —CH 3) — (CH 2) n 2 —CH 3 (where R is composed of one or more monosaccharides 2 to 30) Represents a linear or branched oligosaccharide, wherein Z represents a single bond, or a linker bonded to O, S or NH, or thiomethyl, an aminomethylated sugar alcohol, and Y represents — ( CH2) represents m-, n1 represents an integer of 2 to 40, n2 represents an integer of 1 to 27, and m represents an integer of 1 to 30).本発明は、任意の標的オリゴ糖鎖抗原、特に哺乳動物由来の糖タンパク質のN-結合型糖鎖に含まれるオリゴ糖鎖抗原に対する免疫増強効果を有し、標的のオリゴ糖鎖抗原に対して特異性及び親和性の高いモノクローナル抗体を提供できる、標的オリゴ糖鎖抗原Rを含む一般式(2)で表される糖脂質又はその塩を有効成分とする免疫誘導剤、及びそれを用いた免疫誘導方法を提供する。一般式(2) R-Z-Y-CH(NH-CO-(CH2)n1-CH3)-(CH2)n2-CH3(式中、Rは、1又は複数種の単糖2~30から構成される直鎖状又は分枝状のオリゴ糖を表す。Zは、単結合、又はO、SもしくはNH、又はチオメチルと結合させたリンカー、アミノメチル化された糖アルコールを表し、Yは-(CH2)m-を表す。n1は2~40の整数、n2は1~27の整数、mは1~30の整数を表す。)。