NOVELTY - Curable composition comprises component (A) containing titanium compound and/or zirconium compound having alkoxy group, and titanoxane, zirconoxane, and/or titanoxane-zirconoxane condensate having alkoxy group coupled directly to titanium atom or zirconium atom, component (B) chosen from compound (b1) having titanium and/or zirconium-coordinating group and two or more ethylenically unsaturated groups, and compound (b2) having two or more ethylenically unsaturated groups, or compound having titanium and/or zirconium-coordinating group, polymerization initiator (C) and solvent (D).    USE - Curable composition is used for manufacture of hardened material and cured film e.g. refractive index adjustment film, interlayer insulation film and protective film for liquid crystal display device, organic electroluminescent display and touchscreen display apparatus (all claimed). Uses include but are not limited to microlens, optical waveguide, solar cell, organic electroluminescent light-emitting element, sealing material for LED, chip-coating material for LED, micro-electro-mechanical-system device, solid-state image sensor, solar cell, spacer, etc.    ADVANTAGE - The curable composition has improved compatibility and crack tolerance characteristics after hardening process, and provides cured film having high refractive index and excellent transparency, electrical property, mechanical strength and solvent resistance, and touchscreen display apparatus having improved visibility.    DETAILED DESCRIPTION - Curable composition comprises component (A) containing titanium compound and/or zirconium compound having alkoxy group, titanium compound and/or zirconium compound having halo group, and titanoxane, zirconoxane, and/or titanoxane-zirconoxane condensate having alkoxy group coupled directly to titanium atom or zirconium atom, component (B) chosen from compound (b1) having titanium and/or zirconium-coordinating group and two or more ethylenically unsaturated groups, and compound (b2) having two or more ethylenically unsaturated groups, or compound having titanium and/or zirconium-coordinating group, polymerization initiator (C) and solvent (D). The content of component (A) is 15-40 %mass and the content of component (B) is 40-85 %mass, with respect to the total solid of curable composition. Total content of the compound which has titanium and/or zirconium coordinating group, and compound which has two or more ethylenically unsaturated groups and titanium and/or zirconium-coordinating group is 20-140 parts mass with respect to 100 parts mass total content of component (A). INDEPENDENT CLAIMS are included for the following:    (1) manufacture of hardened material, which involves coating curable composition on substrate, removing solvent from coated curable composition, and hardening the curable composition in which solvent is removed with light and/or heat; and    (2) cured film, which is formed by hardening the curable composition.