An electrochemical device, including: a positive electrode including a positive electrode core material, and a positive electrode material layer supported on the positive electrode core material; a negative electrode including a negative electrode core material, and a negative electrode material layer supported on the negative electrode core material; a separator placed between the positive electrode and the negative electrode; and an electrolyte containing lithium ions. The positive electrode material layer contains a conductive polymer. The positive electrode has a positive electrode non-facing portion where the positive electrode material layer does not face the negative electrode material layer, the positive electrode non-facing portion being larger in area than a negative electrode non-facing portion where the negative electrode material layer does not face the positive electrode material layer in the negative electrode.