A lithium ion secondary battery comprising: an electrode body including a positive electrode provided with a positive electrode active material layer on a positive electrode collector, and a negative electrode provided with a negative electrode active material layer on a negative electrode collector; and a non-aqueous electrolyte, the negative electrode active material layer including: a mixture of a negative electrode active material formed of an amorphous carbon-coated graphite type carbon material having a graphite structure in at least a part thereof and in which at least a part of the surface of the graphite type carbon material is coated with amorphous carbon, and a conductive carbon material, which is different from the graphite type carbon material, wherein the negative electrode active material has a bulk density of 0.5 g/cm 3 or more and 0.7 g/cm 3 or less, and a BET specific surface area of 2 m 2 /g or more and 6 m 2 /g or less, and the conductive carbon material is formed of a conductive amorphous carbon which has a bulk density of 0.4 g/cm 3 or less, and a BET specific surface area of 50 m 2 /g or less, wherein the bulk densities are measured with the measurement method according to JIS K6219-2:2015. an electrode body including a positive electrode provided with a positive electrode active material layer on a positive electrode collector, and a negative electrode provided with a negative electrode active material layer on a negative electrode collector; and a non-aqueous electrolyte, the negative electrode active material layer including: a mixture of a negative electrode active material formed of an amorphous carbon-coated graphite type carbon material having a graphite structure in at least a part thereof and in which at least a part of the surface of the graphite type carbon material is coated with amorphous carbon, and a conductive carbon material, which is different from the graphite type carbon material, wherein the negative electrode active material has a bulk density of 0.5 g/cm 3 or more and 0.7 g/cm 3 or less, and a BET specific surface area of 2 m 2 /g or more and 6 m 2 /g or less, and the conductive carbon material is formed of a conductive amorphous carbon which has a bulk density of 0.4 g/cm 3 or less, and a BET specific surface area of 50 m 2 /g or less, wherein the bulk densities are measured with the measurement method according to JIS K6219-2:2015. a mixture of a negative electrode active material formed of an amorphous carbon-coated graphite type carbon material having a graphite structure in at least a part thereof and in which at least a part of the surface of the graphite type carbon material is coated with amorphous carbon, and a conductive carbon material, which is different from the graphite type carbon material, wherein the negative electrode active material has a bulk density of 0.5 g/cm 3 or more and 0.7 g/cm 3 or less, and a BET specific surface area of 2 m 2 /g or more and 6 m 2 /g or less, and the conductive carbon material is formed of a conductive amorphous carbon which has a bulk density of 0.4 g/cm 3 or less, and a BET specific surface area of 50 m 2 /g or less, wherein the bulk densities are measured with the measurement method according to JIS K6219-2:2015.