The purpose of the present invention is to provide an adhesion improver that is to be used for an edible substrate material for cell culture and contains an edible and non-lethal animal-derived component, a cell culture scaffold material containing the adhesion improver, a tissue body containing the cell culture scaffold material, etc. A cell culture scaffold material suitable for the production of a cultured meat can be produced by applying an adhesion improver containing an edible and non-lethal animal-derived component to an edible substrate material for cell culture.