PURPOSE: To provide a heat-sensitive recording body which has an excellent coloring evenness, and a uniform and stable application layer structure, and head-matching property for a thermal head also.

CONSTITUTION: For the present heat-sensitive recording body, when a coloring layer is provided on a support body by the blade coating process, on a support body of which the modulus of structural breakdown after the change of the instantaneous sure rate (S-1) of a forming liquid for said coloring layer is made to be at the instantaneous sure rate variation coefficient or lower, a coloring agent, and a coloring layer which contains a developing agent to develop coloration by giving a on-heat reaction with said coloring agent are provided.