Double-sided adhesive sheet, image display device-constituting laminate, and image display device

A double-sided adhesive sheet having a laminate structure comprising α layer and β layer, the β layer being a surface layer,

• wherein the α layer is formed from a resin composition containing a (meth)acrylic polymer, a crosslinking agent, and a photopolymerization initiator;
• the β layer is formed from an adhesive composition containing a (meth)acrylic polymer, a crosslinking agent, a photopolymerization initiator that can be activated by light having a wavelength of 405 nm or more, and an ultraviolet absorber;
• and
• the double-sided adhesive sheet has a stress relaxation rate of 30% or more as calculated below,
• wherein the stress relaxation rate is obtained by applying 25% strain to the double-sided adhesive sheet having a thickness in a range of 0.8 to 1.2 mm and a circle shape with a diameter of 8 mm in an environment of 25° C., measuring a stress value (X) after the elapse of 10 seconds and a stress value (Y) after the elapse of 300 seconds, and calculating with the following formula:
• stress relaxation rate (%)={(X−Y)/X}×100.