Provided are a solid food and a solid milk which have suitable solubility and strength adequate to resist breakage during handling. The solid food is a solid food having a solid form obtained by compression molding a food powder, in which an increase Ya (% by weight) in total crystallization rate that is a difference of a crystal ratio with respect to a total weight at a depth Xa (mm) from a surface of the solid food relative to a crystal ratio in an inner part of the solid food satisfies the following Formula (1A), Ya − 5.24 Xa + 6.65