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To provide capsular fine particles comprising an olefinic polymer which have a uniform particle size distribution and a uniform particle size, and which are spherical and free from the coagulation between particles. Capsular fine particles comprising the olefinic polymer, of which the ratio (L/M) of

To provide capsular fine particles comprising an olefinic polymer which have a uniform particle size distribution and a uniform particle size, and which are spherical and free from the coagulation between particles. Capsular fine particles comprising the olefinic polymer, of which the ratio (L/M) of the outer diameter (L) to the inner diameter (M) is 1.1 to 6.0, and the average diameter is 0.6 to 40 μm.

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1. Capsular fine particles consisting of an encapsulated material selected from the group consisting of a gas, a liquid, a solid inorganic material and solid organic material, and an olefinic polymer wherein the olefinic polymer is a homopolymer or copolymer of at least one or more monomers selected

1. Capsular fine particles consisting of an encapsulated material selected from the group consisting of a gas, a liquid, a solid inorganic material and solid organic material, and an olefinic polymer wherein the olefinic polymer is a homopolymer or copolymer of at least one or more monomers selected from the group consisting of linear or branched α-olefins having 2 to 6 carbon atoms, wherein the olefinic polymer is a homopolymer of a single olefinic monomer selected from the group consisting of ethylene, propylene, 1-butene, 3-methyl-1-butene and 4-methyl-1-pentene; or a copolymer containing 0.01 to 10% by mole of another olefinic monomer selected from the group consisting of ethylene, propylene, 1-butene, 3-methyl-1-butene, and 4-methyl-1-pentene. 2. The capsular fine particles according to claim 1, wherein the ratio (L/M) of the outer diameter (L) and the inner diameter (M) of the particles is from 1.1 to 6.0, and the average particle size is from 0.6 to 40 μm. 3. The capsular fine particles according to claim 2, wherein the olefinic polymer has at least one functional group selected from the group consisting of vinyl groups, vinylene groups, vinylidene groups, oxygen-containing groups, nitrogen-containing groups, boron-containing groups, sulfur-containing groups, phosphorus-containing groups, silicon-containing groups, germanium-containing groups, halogen-containing groups and tin-containing groups, and the infrared absorption spectrum of the olefinic polymer obtained after methanol treatment is substantially identical to the infrared absorption spectrum of the olefinic polymer obtained before methanol treatment. 4. The capsular fine particles according to claim 3, wherein the number of the functional groups in the olefinic polymer is 0.01 to 20 per 1000 carbon atoms of the polymer. 5. The capsular fine particles according to claim 2, wherein the aspect ratio is 1.00 to 1.15.