NOVELTY - A metal hydroxide-containing capacitor consists of two metal hydroxide-containing electrodes containing metal hydroxide alignment electrode material, and an electrolyte-impregnated layer provided between the oppositely arranged metal hydroxide-containing electrodes. The metal hydroxide-containing electrodes are electrodes having cobalt hydroxide vertically-aligned graphene/carbon nanotubes composite or plate-shaped metal hydroxide-containing sheet-shaped electrodes comprising sheets containing groove-forming treated conductive fibers woven in a mesh-form.    USE - Metal hydroxide-containing capacitor is used for portable electronic device and vehicle e.g. hybrid electric vehicle and electric vehicle.    ADVANTAGE - The metal hydroxide-containing capacitor has excellent durability and high capacity.    DETAILED DESCRIPTION - A metal hydroxide-containing capacitor consists of two metal hydroxide-containing electrodes containing metal hydroxide alignment electrode material, and an electrolyte-impregnated layer provided between the oppositely arranged metal hydroxide-containing electrodes. The metal hydroxide-containing electrodes are electrodes having cobalt hydroxide vertically-aligned graphene/carbon nanotubes composite formed on one surface of plate-shape electrode, or plate-shaped metal hydroxide-containing sheet-shaped electrodes comprising sheets containing groove-forming treated conductive fibers woven in a mesh-form and several plate-shaped metal hydroxide accumulated on the surface of groove-forming treated conductive fibers. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of cobalt hydroxide vertically-aligned graphene/carbon nanotubes composite, which involves stirring and vacuum-filtering solution containing graphene and carbon nanotubes in ethanol, forming a film-form graphene/carbon nanotubes composite material, carrying out electrodeposition of graphene/carbon nanotubes composite material in an electrolyte solution containing cobalt chloride or cobalt salt, and forming cobalt hydroxide vertically-aligned graphene/carbon nanotubes composite containing cobalt hydroxide crystals growing on the surface of graphene;    (2) plate-shaped metal hydroxide-containing sheet-shaped electrode; and    (3) manufacture of plate-shaped metal hydroxide-containing sheet-shaped electrode, which involves forming sheet containing groove-forming treated conductive fibers, performing electric etching process in formed sheet, carrying out electrodeposition of sheet using a solution containing plate-shaped metal hydroxide, and forming plate-shaped metal hydroxide-containing sheet-like electrode containing plate-shaped metal hydroxide arranged on the surface of groove-forming treated conductive fibers.