The present invention provides a method for preparing adoptive immune cells comprising the following steps of a) obtaining mammalian antigen-presenting associated cells; b) culturing the resulting cells in a culture vessel coated with a sugar chain-containing polymer; and c) detaching the cells by shaking the culture vessel without treating the cells with enzyme and without using a cell detaching tool; adoptive immune cells obtained by this preparing method; a culture vessel coated with a sugar chain-containing polymer for use in this preparation method; a kit for preparing an adoptive immune cell vaccine; and a method and a medicine for treating a malignant tumor, type I diabetes, atopic allergic diseases or infections using the adoptive immune cells.