A method for producing a dual-array-type scintillator array comprising the steps of forming first scintillator sticks comprising first scintillator cell portions arranged like a comb by providing a first scintillator substrate with pluralities of grooves, and then cutting said first scintillator substrate in a direction perpendicular to said grooves; forming second scintillator sticks comprising second scintillator cell portions arranged like a comb by providing a second scintillator substrate having a different composition from that of said first scintillator substrate with pluralities of grooves, and then cutting said second scintillator substrate in a direction perpendicular to said grooves; arranging and fixing plural sets of said first and second scintillator sticks with said first and second scintillator cell portions downward onto a support plate so that said first scintillator sticks and said second scintillator sticks are alternately disposed with a distance (gl, g3) therebetween; removing base portions from said first and second scintillator sticks by grinding to expose the grooves of said first and second scintillator sticks on the surface, thereby obtaining plural sets of first cell arrays and second cell arrays arranged in parallel, each first cell array being obtained from a line of the first scintillator cells, and each second cell array being obtained from a line of the second scintillator cells; forming an integral resin-cured assembly comprising plural sets of said first and second cell arrays arranged in parallel by filling at least grooves and gaps of said first and second cell arrays with a resin for a reflector, curing said resin, and then removing said support plate; and cutting a resin layer between adjacent sets of said first and second cell arrays to divide said resin-cured assembly to sets of said first and second cell arrays. forming first scintillator sticks comprising first scintillator cell portions arranged like a comb by providing a first scintillator substrate with pluralities of grooves, and then cutting said first scintillator substrate in a direction perpendicular to said grooves; forming second scintillator sticks comprising second scintillator cell portions arranged like a comb by providing a second scintillator substrate having a different composition from that of said first scintillator substrate with pluralities of grooves, and then cutting said second scintillator substrate in a direction perpendicular to said grooves; arranging and fixing plural sets of said first and second scintillator sticks with said first and second scintillator cell portions downward onto a support plate so that said first scintillator sticks and said second scintillator sticks are alternately disposed with a distance (gl, g3) therebetween; removing base portions from said first and second scintillator sticks by grinding to expose the grooves of said first and second scintillator sticks on the surface, thereby obtaining plural sets of first cell arrays and second cell arrays arranged in parallel, each first cell array being obtained from a line of the first scintillator cells, and each second cell array being obtained from a line of the second scintillator cells; forming an integral resin-cured assembly comprising plural sets of said first and second cell arrays arranged in parallel by filling at least grooves and gaps of said first and second cell arrays with a resin for a reflector, curing said resin, and then removing said support plate; and cutting a resin layer between adjacent sets of said first and second cell arrays to divide said resin-cured assembly to sets of said first and second cell arrays.