Battery pack

A battery pack to be attached under a floor of a vehicle body, comprising:

• battery modules each including a plurality of battery cells stacked in a first direction in a horizontal direction, the battery modules being arranged side by side at least two in a second direction orthogonal to the first direction in the horizontal direction;
• and
• a case accommodating the battery modules, wherein
• the case includes:
• a case main body on which the battery modules are placed;
• and
• a cross member extending in the first direction inside the case and provided between at least two of the battery modules arranged side by side in the second direction,
• the cross member includes:
• an upper cross member;
• a lower cross member disposed below the upper cross member at a position overlapping the upper cross member when viewed in an upper-lower direction;
• and
• a fixing portion abutting against a bottom surface of the case main body and fixing the upper cross member and the lower cross member to each other by a fastening member,
• the bottom surface of the case main body is integrally provided with at least one first protruding portion that protrudes downward and extends continuously in the second direction, and
• the first protruding portion intersects the cross member at a position overlapping the fixing portion of the cross member when viewed in the upper-lower direction.