A battery pack comprising: a plurality of single cells having a surface and each having positive and negative terminals (41, 42) formed on the surface; a case which accommodates the plurality of single cells arranged in line; and a plurality of insulating members disposed on the surface of the plurality of single cells, respectively, wherein each of the insulating members includes a terminal insulating portion for covering the terminal (41, 42) of the respective single cell from above in a direction perpendicular to the surface by applying the cover from said direction, and each of the insulating members is located so as to correspond to the positive terminal and the negative terminal of the respective same single cell and is located above the positive and negative terminals (41, 42) of the respective same single cell, wherein each of the insulating members has substantially the same width as a size of the single cell in its short side direction as viewed from the surface of the single cell where the terminals (41, 42) are provided, and has substantially the same length as a size of the single cell in its long side direction, and a spacer disposed between adjacent single cells; and a bus bar through which the terminals (41,42) of the adjacent single cells are connected is disposed between said adjacent single cells and the corresponding adjacent insulating members (11a, 11b), wherein the spacer includes an insulating wall disposed between the terminals (41, 42) of the adjacent single cells which are not connected with each other, and wherein the insulating member is attached to the insulating wall. a plurality of single cells having a surface and each having positive and negative terminals (41, 42) formed on the surface; a case which accommodates the plurality of single cells arranged in line; and a plurality of insulating members disposed on the surface of the plurality of single cells, respectively, wherein each of the insulating members includes a terminal insulating portion for covering the terminal (41, 42) of the respective single cell from above in a direction perpendicular to the surface by applying the cover from said direction, and each of the insulating members is located so as to correspond to the positive terminal and the negative terminal of the respective same single cell and is located above the positive and negative terminals (41, 42) of the respective same single cell, wherein each of the insulating members has substantially the same width as a size of the single cell in its short side direction as viewed from the surface of the single cell where the terminals (41, 42) are provided, and has substantially the same length as a size of the single cell in its long side direction, and a spacer disposed between adjacent single cells; and a bus bar through which the terminals (41,42) of the adjacent single cells are connected is disposed between said adjacent single cells and the corresponding adjacent insulating members (11a, 11b), wherein the spacer includes an insulating wall disposed between the terminals (41, 42) of the adjacent single cells which are not connected with each other, and wherein the insulating member is attached to the insulating wall. a bus bar through which the terminals (41,42) of the adjacent single cells are connected is disposed between said adjacent single cells and the corresponding adjacent insulating members (11a, 11b), wherein the spacer includes an insulating wall disposed between the terminals (41, 42) of the adjacent single cells which are not connected with each other, and wherein the insulating member is attached to the insulating wall.