A method for producing a scintillator array comprising fixing a scintillator substrate to a support plate via a double-coated adhesive sheet, at least an adhesive surface thereof to be in contact with the scintillator substrate being thermally peelable; providing the scintillator substrate with lattice-patterned grooves to form pluralities of scintillator cells; filling gaps between the scintillator cells with a liquid hardening reflector resin; curing the liquid hardening reflector resin by heating to form a resin-hardened scintillator cell body; and then peeling the double-coated adhesive sheet from the resin-hardened scintillator cell body by heating.