A positive electrode for a lithium secondary battery, comprising: a current collector; a first positive electrode active material layer on at least one surface of the current collector, the first positive electrode active material layer comprising positive electrode active material particles and a conductive material, the positive electrode active material particles including at least one type of positive electrode active material particles selected from the group consisting of primary macroparticles having an average particle size D50 of 0.5 to 3 μm, secondary particles having an average particle size D50 of 3 to 7 μm formed by agglomeration of the primary macroparticles and a mixture thereof; and a second positive electrode active material layer on the first positive electrode active material layer, the second positive electrode active material layer comprising positive electrode active material particles and a conductive material, the positive electrode active material particles comprising: positive electrode active material secondary microparticles having an average particle size D50 of 1 to 7 μm formed by agglomeration of primary macroparticles having an average particle size D50 of 0.5 to 3 μm or by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, and positive electrode active material secondary macroparticles having an average particle size D50 of 7 to 20 μm formed by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, wherein the average particle size D50 of the secondary macroparticles is larger than the average particle size D50 of the secondary microparticles, wherein the average particle size D50 is measured using a laser diffraction method; wherein the positive electrode active material particles are a nickel-based lithium transition metal oxide positive electrode active material, and wherein the conductive material included in the second positive electrode active material layer comprises single-walled carbon nanotubes. a current collector; a first positive electrode active material layer on at least one surface of the current collector, the first positive electrode active material layer comprising positive electrode active material particles and a conductive material, the positive electrode active material particles including at least one type of positive electrode active material particles selected from the group consisting of primary macroparticles having an average particle size D50 of 0.5 to 3 μm, secondary particles having an average particle size D50 of 3 to 7 μm formed by agglomeration of the primary macroparticles and a mixture thereof; and a second positive electrode active material layer on the first positive electrode active material layer, the second positive electrode active material layer comprising positive electrode active material particles and a conductive material, the positive electrode active material particles comprising: positive electrode active material secondary microparticles having an average particle size D50 of 1 to 7 μm formed by agglomeration of primary macroparticles having an average particle size D50 of 0.5 to 3 μm or by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, and positive electrode active material secondary macroparticles having an average particle size D50 of 7 to 20 μm formed by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, wherein the average particle size D50 of the secondary macroparticles is larger than the average particle size D50 of the secondary microparticles, positive electrode active material secondary microparticles having an average particle size D50 of 1 to 7 μm formed by agglomeration of primary macroparticles having an average particle size D50 of 0.5 to 3 μm or by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, and positive electrode active material secondary macroparticles having an average particle size D50 of 7 to 20 μm formed by agglomeration of primary microparticles having a smaller average particle size D50 than the primary macroparticles, wherein the average particle size D50 of the secondary macroparticles is larger than the average particle size D50 of the secondary microparticles, wherein the average particle size D50 is measured using a laser diffraction method; wherein the positive electrode active material particles are a nickel-based lithium transition metal oxide positive electrode active material, and wherein the conductive material included in the second positive electrode active material layer comprises single-walled carbon nanotubes.