NOVELTY - The apparatus (10) has an insulating member (171), which is aligned with an electric storage device (20). A sandwiching member (170) sandwiches insulating member with electric storage device. Any of insulating member and sandwiching member has a recess (32,33) which has an opening on first surface and recess-side large-diameter portion on bottom side, with inner circumference larger than opening. The other of insulating member and sandwiching member has a projection which has a projection-side large-diameter portion on the distal end side, with an outer circumference larger than the opening.    USE - Electric storage apparatus e.g., battery module, for electric vehicles.    ADVANTAGE - Thickness of insulating member is reduced, so that the dimension from the electric storage device to the sandwiching member is reduced. Allows reduction in size of the electric storage apparatus, since distance between the insulating member and electric storage device is shortened. Relative attitude of the insulating member and sandwiching member engaged to each other is maintained, and thus the electric storage apparatus is assembled more easily. Relative rotation of insulating member and sandwiching member about fitted single recess and projection is prevented. Looseness between insulating member and sandwiching member joined together is suppressed. Recess and projection are formed at a time by pressure molding, thus the relative position is suppressed from deviating. Allows sandwiching members made of metal and the insulating members made of resin to be integrally handled with a simple configuration, thus achieves the ease of assembly, while ensuring the strength by using members made of metal as the pair of sandwiching members that sandwich the electric storage devices so as to prevent increase in size of electric storage apparatus. Ensures sufficient strength, while suppressing the thickness of sandwiching member.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a producing method for an electric storage apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a battery module.    Electric storage apparatus (10)    Electric storage devices (20)    Recesses (32,33)    Sandwiching members (170)    Insulating members (171)