A method for selectively collecting Co from an urban ore obtained by comminuting an electronic device waste and containing Co, the method comprising: a first step of immersing the urban ore in a nitric acid aqueous solution to elute the Co metal contained in the urban ore, and mixing a Co ion adsorbent for adsorbing the collection target Co ions with the resulting Co ion-containing liquid; a second step of separating the Co ion adsorbent from the liquid after the Co ions are adsorbed; a third step of introducing the Co ion adsorbent separated in the second step into a collection liquid that does not contain Co ions, and separating and releasing the Co ions into the collection liquid; a fourth step of separating the Co ion adsorbent from the collection liquid after the Co ions are released; and a fifth step of evaporating the collection liquid from which the Co ion adsorbent is removed in the fourth step, so as to collect the Co ions contained in the collection liquid, the Co ion adsorbent, mixed with the Co ion-containing liquid in the first step, including a support having a continuously mesoporous monolith structure, said support being a HOM (high-order mesoporous) silica, and a compound that has a metal ion-binding group and is chemically bound to inner surfaces of the pores, wherein the combination of compound that has a metal ion-binding group and pH is selected from the following: i) the chelate compound 2-nitroso-1-naphthol is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 6-9 in the first step; ii) the chelate compound pyrogallol red is used as the metal-ion adsorbent, and the metal-ion absorbent is introduced after adjusting the liquid pH to 3.5 in the first step; and iii) the chelate compound 8-(4-n-dodecyl-phenylazo)-quinoxaline (DPAQ) is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 5 in the first step. a first step of immersing the urban ore in a nitric acid aqueous solution to elute the Co metal contained in the urban ore, and mixing a Co ion adsorbent for adsorbing the collection target Co ions with the resulting Co ion-containing liquid; a second step of separating the Co ion adsorbent from the liquid after the Co ions are adsorbed; a third step of introducing the Co ion adsorbent separated in the second step into a collection liquid that does not contain Co ions, and separating and releasing the Co ions into the collection liquid; a fourth step of separating the Co ion adsorbent from the collection liquid after the Co ions are released; and a fifth step of evaporating the collection liquid from which the Co ion adsorbent is removed in the fourth step, so as to collect the Co ions contained in the collection liquid, the Co ion adsorbent, mixed with the Co ion-containing liquid in the first step, including a support having a continuously mesoporous monolith structure, said support being a HOM (high-order mesoporous) silica, and a compound that has a metal ion-binding group and is chemically bound to inner surfaces of the pores, wherein the combination of compound that has a metal ion-binding group and pH is selected from the following: i) the chelate compound 2-nitroso-1-naphthol is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 6-9 in the first step; ii) the chelate compound pyrogallol red is used as the metal-ion adsorbent, and the metal-ion absorbent is introduced after adjusting the liquid pH to 3.5 in the first step; and iii) the chelate compound 8-(4-n-dodecyl-phenylazo)-quinoxaline (DPAQ) is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 5 in the first step. i) the chelate compound 2-nitroso-1-naphthol is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 6-9 in the first step; ii) the chelate compound pyrogallol red is used as the metal-ion adsorbent, and the metal-ion absorbent is introduced after adjusting the liquid pH to 3.5 in the first step; and iii) the chelate compound 8-(4-n-dodecyl-phenylazo)-quinoxaline (DPAQ) is used as the metal-ion adsorbent, and the metal-ion adsorbent is introduced after adjusting the liquid pH to 5 in the first step.