BATTERY MODULE

A first imaginary arc is defined with a first imaginary point as a center, the first imaginary arc including three points that are a center and both ends of a third portion in a second direction orthogonal to a first direction, the first imaginary point being located on a fourth portion side with respect to a first imaginary straight line that connects the both ends of the third portion in the first direction. A second imaginary arc is defined as a center, the second imaginary arc including three points that are a center and both ends of the fourth portion in the second direction, the second imaginary point being located on the third portion side with respect to a second imaginary straight line that connects the both ends of the fourth portion in the first direction.