An object of the present invention is to provide a method in which adherent animal cells are normally cultured and proliferated in a floating state, and the cultured and proliferated adherent animal cells are re-established in a desired place. A cell release method according to the present invention is characterized in that lactoferrin is added to a culture solution of a culture vessel in which cells are cultured. In addition, the cell culture method according to the present invention is characterized in that cells are suspended and cultured in a culture solution containing lactoferrin. The cell fixing method according to the present invention is characterized by diluting lactoferrin, transferring a culture solution containing floating cells to a laminin-coated incubator, or adding glycosaminoglycan. In these, the cells are adherent animal cells, and the culture medium contains serum. [Selection] Figure 1
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