To provide a lean vehicle battery capable of outputting a large voltage and attaining improvement of durability to vibration, and reduction in weight.SOLUTION: A power storage cell aggregate case includes: a power storage cell aggregate case lower constituent member including a tabular bottom face having a first principal surface on which a power storage cell aggregate is mounted, the power storage cell aggregate case lower constituent member being structured not to be separated into multiple small members; and a power storage cell aggregate case upper constituent member fixed to the power storage cell aggregate case lower constituent member, the power storage cell aggregate case upper constituent member being structured to be separated into a stationary power storage cell aggregate case upper constituent small member which is fixed to the power storage cell aggregate case lower constituent member, and a power storage cell aggregate case upper constituent small member. A size of the stationary power storage cell aggregate case upper constituent small member in a vertical direction is larger than a size of the power storage cell aggregate case lower constituent member in a vertical direction.SELECTED DRAWING: Figure 1
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