Hollow particles

Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell,

• wherein a void ratio is 50% or more, and
• wherein a residual void ratio measured by the following press test method is 80% or more:
• [press test method]
• a mixture obtained by melting and mixing 0.1 g of the hollow particles and 0.9 g of a polypropylene resin at 200° C., is poured into a mold for a hot press machine, heated at 200° C. for 15 minutes, and then stirred;
• the mold filled with the mixture is installed in the hot press machine set to 80° C.;
• a cylinder at 80° C. is put in the mold and left to stand;
• the mixture is pressed at 60 MPa when a surface temperature of the mold reaches 140° C., thereby obtaining a molded body of the mixture;
• the molded body is removed from the mold and pressed at a pressure of 1 MPa or less, thereby forming the molded body into a sheet shape;
• and the residual void ratio of the hollow particles contained in the obtained sheet-shaped molded body is measured.