Hollow particles and production method therefor

A production method for hollow particles, which have a shell portion formed by a polymer of a monomer component comprising a divinyl aromatic compound and a monovinyl aromatic compound and a hollow portion surrounded by the shell portion, wherein a dielectric loss tangent measured by cavity resonance method (frequency:

• 10 GHz (room temperature)) is 1.00×10−3 or less, comprising:
• (a) mixing the monomer component and a normal paraffinic solvent having a carbon number of 9 or more, isoparaffinic solvent, or naphthenic solvent as a hydrophobic solvent to obtain an oil-based mixture liquid;
• (b) mixing the oil-based mixture liquid with water to obtain an emulsion liquid in which the oil-based mixture liquid is dispersed in the water;
• (c) polymerizing the monomer component in the emulsion liquid to form the polymer encapsulating the hydrophobic solvent;
• and
• (d) (d1) washing the polymer with water and (d2) washing the polymer with an organic solvent to remove the hydrophobic solvent encapsulated in the polymer.