HEAT MEASUREMENT DEVICE

A heat measurement device includes: a high-heat portion disposed on a first end portion in the power storage device; a low-heat portion disposed on a second end portion in the power storage device; a first temperature sensor disposed on the first end portion in the power storage device; a second temperature sensor disposed on the second end portion in the power storage device; and a cover member that is provided to cover at least a portion of a side surface of the power storage device located between the first end portion and the second end portion and that holds the power storage device. The cover member includes an inner surface facing the side surface of the power storage device, and a rib that protrudes from the inner surface and that is in abutment with the side surface of the power storage device.