PROBLEM TO BE SOLVED: To provide an electrode which exhibits good characteristics concerning an initial discharge capacity, charge and discharge cycles, and a shelf life in high-temperature storage, has a satisfying binding strength, and allows the delamination of an electrode sheet to be suppressed in a manufacturing process mainly in the field of secondary batteries.SOLUTION: An aqueous composition for a secondary battery electrode comprises: a polymer water dispersion (material)(I); a water-soluble polymer (II); and a lithium-containing complex oxide (III) which is capable of occluding and releasing lithium ions, and includes at least a lithium manganate. The solid weight ratio (A) of the polymer water dispersion (material)(I) to the water-soluble polymer (II) satisfies the inequality expression (1) below. The total solid parts by weight (B) of the polymer water dispersion (material)(I) and the water-soluble polymer (II) to 100 pts.wt. of the lithium-containing complex oxide (III) meets the inequality expr
