A cell binder includes a frame body and a frame body. A storage portion of a electric storage cell are pressed/clamped by the bottom of an accommodating portion of the frame body and the bottom of an accommodating portion of the frame body. Also, a sealing portion of the electric storage cell is accommodated in a gap between the bottom of a fitting concave portion of the frame body 16 and the front end of a projecting portion of the other frame body, in a state of being deflected by bending, and the sealing portion is clamped between an inner wall of the fitting concave portion and an outer wall of the projecting portion, thereby fitting the frame bodies to each other. This makes it possible to reduce the size for clamping the sealing portion and to achieve the downsizing of the entire package. In addition, providing the sealing portion with deflections allows movements of the electric storage cell to be accommodated when vibrations are applied. This eliminates a possibility that the sealing portion will be damaged by a shearing stress, and leads to durability to be improved.