COMPOSITION FOR ELECTROCHEMICAL DEVICE FUNCTIONAL LAYER, FUNCTIONAL LAYER FOR ELECTROCHEMICAL DEVICE, AND ELECTROCHEMICAL DEVICE

A composition for an electrochemical device functional layer contains a polymer A and a solvent. The polymer A contained in the composition for an electrochemical device functional layer includes an alkylene oxide structure-containing monomer unit in a proportion of not less than 5 mol % and not more than 95 mol %.