Provided are an oral formulation capable of improving easy administrability and showing good preservation stability, and a substrate for oral formulation. An oral formulation containing a medicament; sugar alcohol; one or more kinds of hydrophilic polysaccharides selected from the group consisting of acacia, pullulan and maltodextrin; a gelling agent; and water, and a substrate for oral formulation, which contains sugar alcohol; the above-mentioned hydrophilic polysaccharides; a gelling agent; and water.