There is provided a method for producing a resin particle capable of unprecedentedly realizing both excellent heat resistant keeping property and melting property. The present invention is a method for producing a resin particle (X) comprising the step of treating a resin particle (B) containing a resin (A) composed of a crystalline part (a) containing, as an essential constitutional component, a polyester (p1) not containing an aromatic ring or a polyester (p2) containing an aromatic ring, and produced by polycondensation of a polyol component and a polycarboxylic acid component, and a noncrystalline part (b), with liquid or supercritical carbon dioxide (C), and removing (C), wherein a heat of fusion measured by differential scanning calorimetry (DSC) of the obtained (X) satisfies the following relational formula (1): 0≦H2/H1≦0.9  (1) [in the relational formula (1), H1 represents a measurement value of a heat of fusion (J/g) at the time of the initial temperature elevation measured by DSC; and H2 represents a measurement value of a heat of fusion (J/g) at the time of the second temperature elevation measured by DSC].