ELECTRODE AND ELECTRICITY STORAGE DEVICE

An electrode of the present invention includes: an electrically conductive support (11); and an active material layer (12) provided on the electrically conductive support (11), containing an electrode active material (13) and an electrical conductivity assistant (14) , wherein: the electrode active material (13) includes at least one of a first polymer compound having a tetrachalcogenofulvalene structure in a repetition unit of a main chain, and a second polymer compound which is a copolymer between a first unit which has the tetrachalcogenofulvalene structure in a side chain and a second unit which does not have the tetrachalcogenofulvalene structure in the side chain; and in active material layer (13), the electrode active material (13) does not form particles but covers at least a portion of a surface of the electrical conductivity assistant (14).