NOVELTY - A secondary battery for electronic appliance comprises a battery cell (3) including a positive electrode, negative electrode, and electrolyte in a pack (23); a positive (21) and negative electrode terminal (22) from positive electrode and negative electrode, a battery cell holder (30) including a face part and two opposing longitudinal faces; and a cover including terminal parts configured to be connected to the positive and negative electrodes upon being connected to the positive electrode terminal and the negative electrode terminal and faced outwardly.    USE - As secondary battery for an electronic appliance (claimed); as lithium ion secondary battery or lithium polymer secondary battery.    ADVANTAGE - The secondary battery meets the demands for electronic appliances in recent years such as downsizing, lightweight and slimming. Since the battery cell is adhered onto an inner face of the battery can, it prevents unsteadiness of the battery cell within the battery can and to absorb an impact as caused due to falling or vibration of the battery can, thus preventing a phenomenon that the impact is applied to a joining part among the positive electrode terminal and the negative electrode terminal and the terminal parts from occurring. By achieving adhesion via an elastic member or folding an overlap width of the battery cell along a side face and then inserting it into the battery can, the elastic member or the folded overlap width can function as a buffer member between the battery cell and the battery can. In addition, in the secondary battery, when the battery cell is inserted into the battery can upon sticking an insulating film to the elastic member, the insulating film is arranged along the side face of the battery cell to cover an aluminum layer of the pack which is exposed on the cut face of the overlap width part, it is possible to devise to achieve insulation from an inner wall of the battery can. Accordingly, even in the case where the metallic battery can is charged, it prevents electrolytic corrosion as caused by conductance between battery can and aluminum layer of pack from occurring. The battery can and the lid are each formed in a substantially trapezoidal shape with respect to the cross section such that an edge in each side of the short sides is formed in a circular arc shape, and the battery installing part in the side of the electronic appliance is also formed in the same shape. Thus, in the case where the insertion face is turned inside out, since the edge of the battery installing part and the edge of the secondary batter interfere with each other, thus inhibiting the insertion, and prevents erroneous insertion.    DETAILED DESCRIPTION - A secondary battery for an electronic appliance comprises a battery cell (3) including a positive electrode, a negative electrode, and an electrolyte in a pack (23), a positive electrode terminal (21) and a negative electrode terminal (22) from the positive electrode and the negative electrode, respectively being each led out from a first side face of the battery cell; a battery cell holder (30) including a face part and two opposing longitudinal faces, the battery cell holder accommodating the battery cell in it; and a cover including terminal parts configured to be connected to the positive and negative electrodes upon connected to the positive electrode terminal and the negative electrode terminal and faced outwardly, the cover adjoining the battery cell holder, where a cross section of an entirety of the secondary battery has a substantially trapezoidal flat plate shape including a long edge, a short edge that is shorter than the long edge, and opposing adjoining sides, which adjoin the long edge and the short edge; and the positive electrode terminal and the negative electrode terminal are faced outwardly and are disposed closer to the short edge of the trapezoidal shape than to the long edge. The battery cell is inserted into the battery cell holder such that each side of the battery cell and each short side of the battery cell corresponds to a long side of the battery cell holder and a short side of the battery cell holder, respectively. A clearance exists between the battery cell and an inner periphery of the battery cell holder. A second side face of the battery cell opposes the first side face and is adhered to a bottom face of the battery cell holder via an elastic member. The elastic member includes an insulating film which is arranged between a cut face of the pack and an inner wall of the battery cell holder. A principal face of the battery cell is adhered to a principal face of the battery cell holder by an adhesive disposed on the principal face of the battery cell holder. The battery cell is accommodated in the battery cell holder after folding an overlap width part of the pack along an outside face of the pack.    DESCRIPTION OF DRAWING(S) - The figure shows a view of secondary battery.    Metallic battery can (2)    Battery cell (3)    Battery lid (4)    Engagement holes (6)    Positive electrode terminal (21)    Negative electrode terminal (22)    Pack (23)    Battery cell holder (30)