Lead conductors, and power storage device

PROBLEM TO BE SOLVED: To provide a lead conductor for power storage device which is thin and narrow but unlikely to be broken, and a power storage device comprising the lead conductor.SOLUTION: The present invention relates to the lead conductor to be used for the power storage device comprising a positive electrode, a negative electrode, an electrolyte and a container for accommodating them. The lead conductor consists of an aluminum alloy containing Si in 0.1 mass% or more and 1.2 mass% or less and containing Mg less than 1.5 mass% in a mass ratio Mg/Si ranging from 0.8 or more to 2.7 or less. A tensile strength is 100 MPs or more and 220 MPa or less and conductivity is 50%IACS or more.SELECTED DRAWING: Figure 1