In order to accurately protect current collectors included in an electric storage device, the electric storage device includes an electric storage element 3 arranged inside an electric storage device case BC; an electrode terminal 5 arranged outside the electric storage device case; a current collector 4 including a first posture part FP and a second posture part SP, the first posture part FP extending along a surface of the electric storage device case on which the electrode terminal 5 is arranged, the second posture part SP extending from an end portion of the first posture part toward the side opposite to the electrode terminal, the current collector fixed at the first posture part FP by means of a fixing member 8 penetrating through an opening formed in the electric storage device case, the current collector supporting the electric storage element 3 by the second posture part SP, thereby electrically connecting the electrode terminal 5 and the electric storage element 3; and a reinforcing member 13 arranged on the side of the first posture part FP where the electric storage element 3 is present, so as to extend longer toward the second posture part side than the fixing member 8, and sandwiched and fixed between the first posture part FP and the fixing member 8.