A battery case comprising: a storage part (3, 4) made of resin for storing a laminate of battery cells; and a fiber tape (6, 7) arranged integrally with side walls (11, 12, 13, 16, 17) forming the storage part (3, 4) and formed by impregnating unidirectional continuous fiber arranged in a longitudinal direction with resin, wherein the side walls include a first side wall erected along a lamination direction of the battery cells, and a second side wall (12, 16) and a third side wall (13, 17) continued from the first side wall, erected in a direction intersecting with the lamination direction of the battery cells, the second side wall (12, 16) and the third side walls (13, 17) are holding the laminate of the battery cells at both ends in the lamination direction, the fiber tape (6, 7) is arranged from the second side wall (12, 16) to the third side wall (13, 17) through the first side wall, a length of the fiber tapes (6, 7) is longer than the first side wall, the battery case includes a first storage part and a second storage part adjacent to the first storage part as the storage part, the lamination direction of the battery cells in the first storage part and the second storage part is the same direction, and the first side wall of the first storage part and the first side wall of the second storage part are erected as one body between the first storage part and the second storage part, characterized in that additional unidirectional fiber tape (22, 23) is additionally arranged in a position between the second side wall of the first storage part and the second side wall of the second storage part and a position between the third side wall of first storage part and the third side wall of the second storage part in addition to the fiber tape arranged from the second side wall to the third side wall through the first side wall and the fiber tape arranged from the second side wall to the third side wall through the first side wall. the side walls include a first side wall erected along a lamination direction of the battery cells, and a second side wall (12, 16) and a third side wall (13, 17) continued from the first side wall, erected in a direction intersecting with the lamination direction of the battery cells, the second side wall (12, 16) and the third side walls (13, 17) are holding the laminate of the battery cells at both ends in the lamination direction, the fiber tape (6, 7) is arranged from the second side wall (12, 16) to the third side wall (13, 17) through the first side wall, a length of the fiber tapes (6, 7) is longer than the first side wall, the battery case includes a first storage part and a second storage part adjacent to the first storage part as the storage part, the lamination direction of the battery cells in the first storage part and the second storage part is the same direction, and the first side wall of the first storage part and the first side wall of the second storage part are erected as one body between the first storage part and the second storage part, characterized in that additional unidirectional fiber tape (22, 23) is additionally arranged in a position between the second side wall of the first storage part and the second side wall of the second storage part and a position between the third side wall of first storage part and the third side wall of the second storage part in addition to the fiber tape arranged from the second side wall to the third side wall through the first side wall and the fiber tape arranged from the second side wall to the third side wall through the first side wall.