Provided is an inorganic particle dispersion, in particular, an inorganic particle dispersion for cosmetics, said inorganic particle dispersion containing a novel block copolymer capable of improving the dispersibility of inorganic particles. The inorganic particle dispersion, in particular, inorganic particle dispersion for cosmetics according to the present invention comprises a dispersion medium, inorganic particles dispersed in the dispersion medium and a block copolymer having a hydrophobic segment and a hydrophilic segment, wherein the hydrophobic segment has a monomer unit formed of at least one kind of monomer selected from formula 1 and formula 2, the hydrophilic segment is at least partly adsorbed by the inorganic particles, and the hydrophobic segment is arranged outside of the inorganic particles. In formula 1, R1 represents hydrogen or a methyl group, R2 represents hydrogen or fluorine, m is an integer of 0-6, and n is an integer of 1-15. In formula 2, R1 represents hydrogen or a methyl group, R3 and R4 independently represent an alkyl group having 1-6 carbon atoms, m is an integer of 1-6, and p is an integer of 5-70.本發明提供一種包含能夠使無機粒子之分散性提昇之新穎嵌段共聚物之無機粒子分散液、尤其是化妝料用無機粒子分散液。本發明之無機粒子分散液、尤其是化妝料用無機粒子分散液包含：分散介質、分散於該分散介質中之無機粒子、以及含有疏水性鏈段及親水性鏈段之嵌段共聚物，上述疏水性鏈段含有包含選自下述式1及式2之至少一種單體之單體單元，上述親水性鏈段之至少一部分吸附於上述無機粒子，且上述疏水性鏈段相對於無機粒子向外側配向；式1中，R1為氫或甲基，R2為氫或氟，m為0～6之整數，且n為1～15之整數，式2中，R1為氫或甲基，R3及R4分別獨立地為碳原子數1～6之烷基，m為1～6之整數，且p為5～70之整數。
