PURPOSE: To provide a gel containing a shaped source, prepared by enclosing a shaped solid source having a prescribed shape in a gel such as gelly and capable of liquefying the solid source in the gel by heating for sterilization, etc., without deformation of the source shape or oozing out of the source.

CONSTITUTION: A source in a shaped solid state is enclosed in a gelatinizable sol and liquefied by dissolving the solidification conditions and a gelatinizable substance forming a gel exhibiting a high melting point is used as the gel. Or, a source unit prepared by mixing a metal salt capable of reacting with sodium alginate or pectin and of forming an insoluble gel in a shaped solid source in advance or by making a metal salt adhere to the surface of a shaped solid source is enclosed in a gel unit prepared by dissolving a high-molecular polysaccharide such as sodium alginate or pectin capable of forming an insoluble get by a reaction with a metal in a gelatinizable sol.