The present invention retains the original shape, color, taste, flavor and texture, suppresses liquating out nutritional contents, can easily adjust the hardness of a food to the desired hardness, does not require extreme care for deformation even though it is soft, is easy to handle during the manufacturing process, transportation and distribution process, can efficiently manufacture a processed food which uses a wide variety of food materials, can preserve by suppressing microbial deterioration due to its hygienic manufacture, particularly aims to promote appetite for the elderly and the like in oligotrophic conditions, and can laconically, easily and inexpensively manufacture a processed food in a short period of time, wherein the food is capable of supplying nutritious substance according to need. The method of manufacturing a food of the present invention including bringing either one or both of a thickener in a non-solvated state and microorganism which generates a viscous material into contact with the surface of a food material, and performing a pressure treatment, such that the food retains the shape of the food material and uniformly includes either one or both of a thickener in a non-solvated state and microorganism which generates a viscous material inside.
