Method of producing hollow particles, method of producing antireflection coating, and method of producing optical element

A method of producing hollow particles, comprising:

• synthesizing core-shell particles comprising a core containing 51% by mass or more of an organic compound and a shell containing 51% by mass or more of an inorganic-based compound in an aqueous medium;
• after the synthesizing, reacting the core-shell particles with a silane coupling agent or a silylating agent before being heated;
• dispersing the core-shell particles in an organic solvent;
• and
• after the dispersing, preparing hollow particles by heating the core-shell particles dispersed in the organic solvent to remove the core therefrom,
• wherein the core-shell particles are heated in a sealed container in the preparation of the hollow particles, and
• wherein the core-shell particles are heated at a temperature of 350 to 500 degrees (Celsius) and a pressure of 4.0 to 30 MPa so as to produce the hollow particles by removing cores from the core-shell particles.