NOVELTY - An active-energy-ray-hardening-type composition comprises component (A) and/or component (B), and component (C). The component (A) is (meth)acrylate-type polymer having (meth)acryloyl group in a side chain, obtained by reacting polymer (a1) having carboxyl group or functional group which can react with hydroxyl group in a side chain, and compound (a2) having carboxyl group or hydroxyl group, and (meth)acryloyl group and number average molecular weight of 180 or more. Component (C) is compound having 2 or more ethylenically unsaturated groups.    USE - Active-energy-ray-hardening-type composition is used for electron beam cured composition used in manufacture of cured material e.g. optical film/sheet for transparent conductive film (all claimed). Uses include but are not limited to protective film for polarizing plate for touchscreen integrated liquid-crystal display device for smart phone, tablet terminal and car-navigation system, solar cell, LED lighting and organic electroluminescent illumination and flexible electronics.    ADVANTAGE - The active-energy-ray-hardening-type composition provides optical film/sheet having excellent heat resistance, bending resistance and external appearance, and low in-plane retardation value and water absorptivity.    DETAILED DESCRIPTION - An active-energy-ray-hardening-type composition comprises component (A) and/or component (B), and component (C). The content of component (A) and component (B) contained with respect to total content of components (A), (B) and (C) is 50-95 wt.% and 50-95 wt.%, respectively. The content of component (C) contained with respect to total content of components (A) and (B) is 5-50 wt.%. The component (A) is (meth)acrylate-type polymer having (meth)acryloyl group in a side chain, obtained by reacting polymer (a1) having carboxyl group or functional group which can react with hydroxyl group in a side chain, and compound (a2) having carboxyl group or hydroxyl group, and (meth)acryloyl group and number average molecular weight of 180 or more. The component (B) is (meth)acrylate-type polymer having a (meth)acryloyl group in a side chain, obtained by reacting polymer (b1), and compound (b2) having (meth)acryloyl group and functional group which can react with carboxyl group or hydroxyl group. Polymer (b1) is (meth)acrylate-type polymer having carboxyl group or hydroxyl group, obtained by copolymerizing compound (a2) and copolymerizable monomer. Component (C) is compound having 2 or more ethylenically unsaturated groups. A cured material of the composition has glass transition temperature of 120 degrees C or more and water absorptivity of 2% or less. INDEPENDENT CLAIMS are included for the following:    (1) electron beam cured composition, which contains the composition;    (2) cured material of composition;    (3) manufacture of optical film or sheet, which involves coating the composition on the film-or-sheet-like base material, and irradiating an active energy ray from coating surface side or film/sheet-like base material side; and    (4) transparent conductive film, which has a transparent conductor layer on surface(s) of the optical film or sheet.