A novel hemostatic material (aqueous dispersion) that can be applied by a simple method of application in the form of a liquid or a spray mist to a bleeding wound surface, exhibits an excellent solidifying action on all of plasma, serum, and blood, and achieves a hemostatic effect quickly and easily. An aqueous dispersion comprising insoluble polysaccharides having an average fiber diameter of 0.001 to 100 μm and a ratio (L/D) of an average fiber length (L) to an average fiber diameter (D) of 5 to 500, wherein the aqueous dispersion causes plasma, serum, or blood to solidify under contact with plasma, serum, or blood.
