The present invention provides a novel immunity induction method, particularly, a method of simultaneously inducing activation of NKT cells and T-cell immune responses. To be more precise, the present invention provides a target antigen and CD1d co-expressing cell, and a preparation and identification method thereof； a target antigen and CD1d co-expressing cell capable of activating immunity to the target antigen, and a preparation method thereof； an immunoinducer to a target antigen or a pharmaceutical agent, which contains a target antigen and CD1d co-expressing cell capable of activating immunity to the target antigen； a target antigen and CD1d co-expressing vector； a kit containing an expression vector and/or a CD1d ligand； and the like.
