A composite active material for lithium secondary batteries which is produced by a method comprising: a mixing step of mixing expanded graphite and the battery active material capable of combining with lithium ions with each other to obtain a mixture, wherein the battery active material is mixed in an amount of 10 to 230 parts by mass based on 100 parts by mass of the graphite; a compression step of compressing the mixture with an unidirectional press to obtain a compressed mixture; and a spheroidization step of subjecting the compressed mixture to a spheroidization treatment, and the composite active material for lithium secondary batteries is constituted by flat-shaped particles having any of a rounded disk shape, a flattened ellipsoidal body shape, or a broad bean-type shape, the flat-shaped particles include structures in which particles of a battery active material capable of combining with lithium ions are sandwiched between folds consisting of graphite, the battery active material capable of combining with lithium ions has an average particle diameter of 1 μm or less, defined as volume-based particle size distribution value of 50% and measured according to the description, in a cross section vertical to the flat surface of the flat-shaped particles, some of the folds consisting of graphite are inclined from a vertical axis direction to the flat surface, the some of the folds being positioned other than at a vicinity of both ends in the longitudinal direction in the cross section, wherein the flat surface is the surface viewed from above in a state where the flat-shaped particles are placed on an even surface, the structures in which the particles of the battery active material capable of combining with lithium ions are sandwiched between the folds consisting of graphite are stacked in parallel generally with the flat surface, an area ratio of a particle layer of the battery active material capable of combining with lithium ions exposed onto a surface of the composite active material for lithium secondary batteries, as measured by scanning electron microscope observation at an accelerating voltage of 10 kV or less, is 5% or less. a mixing step of mixing expanded graphite and the battery active material capable of combining with lithium ions with each other to obtain a mixture, wherein the battery active material is mixed in an amount of 10 to 230 parts by mass based on 100 parts by mass of the graphite; a compression step of compressing the mixture with an unidirectional press to obtain a compressed mixture; and a spheroidization step of subjecting the compressed mixture to a spheroidization treatment, and the composite active material for lithium secondary batteries is constituted by flat-shaped particles having any of a rounded disk shape, a flattened ellipsoidal body shape, or a broad bean-type shape, the flat-shaped particles include structures in which particles of a battery active material capable of combining with lithium ions are sandwiched between folds consisting of graphite, the battery active material capable of combining with lithium ions has an average particle diameter of 1 μm or less, defined as volume-based particle size distribution value of 50% and measured according to the description, in a cross section vertical to the flat surface of the flat-shaped particles, some of the folds consisting of graphite are inclined from a vertical axis direction to the flat surface, the some of the folds being positioned other than at a vicinity of both ends in the longitudinal direction in the cross section, wherein the flat surface is the surface viewed from above in a state where the flat-shaped particles are placed on an even surface, the structures in which the particles of the battery active material capable of combining with lithium ions are sandwiched between the folds consisting of graphite are stacked in parallel generally with the flat surface, an area ratio of a particle layer of the battery active material capable of combining with lithium ions exposed onto a surface of the composite active material for lithium secondary batteries, as measured by scanning electron microscope observation at an accelerating voltage of 10 kV or less, is 5% or less.