To provide a hollow polymer particle that imparts a coated paper that is excellent in opacity and water absorption.

Provided is a hollow polymer particle that includes: a core polymer layer (A); at least one shell layer (B) that substantially enclosures the core polymer layer (A); and at least one air gap that is formed by neutralizing at least one portion of an acidic group included in a core polymer particle. The hollow polymer particle is characterized in that a layer that enclosures the air gap includes two or more projection parts that project toward an inside of the air gap and in which a height is at least 50 nm, and forms an uneven structure.