The present invention relates to an electrode assembly which can improve product stability in the manufacture thereof by stacking a plurality of electrode units, and a manufacturing method for the electrode assembly. In addition, the present invention comprises: a plurality of electrode units each having an electrode tab formed thereon; and a length-side separation film member being folded in a direction, in which the electrode tab is formed, and in a direction opposite to the direction in which the electrode tab is formed while stacking the plurality of electrode units so as to be separated from one another.