The present invention relates to a positive electrode material, and relates to a positive electrode material, a method for preparing same, and a lithium secondary battery comprising same, the positive electrode material comprising a first positive electrode active material and a second positive electrode active material that have different average particle diameters D50 and having bimodal particle size distribution, wherein the first positive electrode active material includes a lithium composite transition metal oxide, and the number of primary particles, as measured from a cross-sectional SEM image of secondary particles having an average particle diameter D50 in which the maximum peak of area cumulative particle size distribution of the first positive electrode active material, as measured through a laser diffraction particle size measurement device, appears, is 6 to 30.