Abstract: Provided is a temperature measurement device including: a case; a flexible printed circuit board attached to the case; a pressing plate; and an elastic body, in which: the flexible printed circuit board includes a thermistor element region; the elastic body is interposed between the thermistor element region and the pressing plate; the pressing plate is configured to press the thermistor element region through the elastic body; the case has a through-hole; as viewed in a direction of pressing the thermistor element region by the pressing plate, the thermistor element region and the elastic body are positioned within an area where the through-hole is provided; and the thermistor element region is configured to protrude, through the through-hole, from an attachment surface side of the case attached to the flexible printed circuit board toward a surface side of the case opposite to the attachment surface side.

Abstract: Provided is a flexible printed wiring board attached to a battery, including: multiple lines are provided only on one surface of the flexible printed wiring board, one end of a first line group and a second line group are respectively connected to one of multiple terminals of the battery, and the other end of the first line group is arranged in a bent portion, and the other end of the second line group and one end of a third line group are arranged at an end portion of a trunk portion, and the other end of the third line group is arranged in the trunk portion, and the bent portion is bent such that the other end of the first line group arranged in the bent portion and the other end of the third line group arranged in the trunk portion are connected to each other.