This invention provides a two-component local injection solution for submucosal injection, comprising the following (i) and (ii):(i) a polysaccharide aqueous solution containing at least one member selected from the group consisting of sodium alginate, carrageenan, and gellan gum; and(ii) an aqueous salt solution containing at least one cation selected from the group consisting of sodium ions and calcium ions,wherein when the polysaccharide is sodium alginate, the cation comprises calcium ions.