PROBLEM TO BE SOLVED: To provide a method of simply and surely estimating adhesion of a coating formed of cobalt compound for a coating nickel hydroxide powder for an alkaline secondary battery positive electrode active material in short time.SOLUTION: Coating nickel hydroxide powder for an alkaline secondary battery positive electrode active material coated with a cobalt compound on the surfaces of nickel hydroxide particles is charged into a hermetically-sealable cylindrical transparent cell 1 together with a certain rate of water, and shaken for a constant time by reciprocating motion in a direction a parallel to the center axis of the cylindrical transparent cell 1. After the shaking is completed, an adhesion level is visually determined on the basis of deposits adhering to the wall surface of the cylindrical transparent cell 1, or after non-adhering precipitated slurry is washed out, deposits on the wall surface is re-dispersed into water solution, and the turbidity of the thus-obtained dispersion liquid
