NOVELTY - A lithium secondary battery has negative electrode (20) having negative electrode active material layer (24) on negative electrode collector (22). The layer (24) contains a negative electrode active material (26) and a binder (28), and has thickness of 50 mu m or less. When the layer (24) is divided into halves in the thickness direction and a half that is closer to collector (22) is defined as lower layer (24a) and the other half is defined as upper layer (24b), the binder concentration (mass%) of upper layer is different from that of lower layer and uneven distribution degree is 0.4-1.    USE - Lithium secondary battery used as power supply for vehicle (claimed), personal computer and portable terminal.    ADVANTAGE - The lithium secondary battery in which deterioration of the performance due to deposition of lithium is suppressed, is provided. The lithium secondary battery has high durability and charging/discharging characteristics.    DETAILED DESCRIPTION - A lithium secondary battery comprises a negative electrode (20) obtained by forming a negative electrode active material layer (24) on a negative electrode collector (22). The layer (24) contains a negative electrode active material (26) and a binder (28), and has thickness of 50 mu m or less. The binder content in the layer (24) is 1 %mass or less. When the layer (24) is divided into halves in the thickness direction and a half that is closer to collector (22) is defined as a lower layer (24a) and the other half, which is farther from the collector (22), is defined as an upper layer (24b), the binder concentration (mass%) of the upper layer (24b) is different from that of the lower layer (24a) and the uneven distribution degree (X) (B/A) of the binder represented by the value obtained by dividing the binder concentration (B) in the upper layer (24b) by the binder concentration (A) in the lower layer (24a), is 0.4-1, preferably 0.4-0.8.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of lithium secondary battery.    Negative electrode (20)    Negative electrode collector (22)    Negative electrode active material layer (24)    Lower layer (24a)    Upper layer (24b)    Negative electrode active material (26)    Binder (28)