To provide a battery protector reduced in size and easy to manufacture, and a battery pack.

When the protector is attached to a battery 8, the battery protector turns first and second fixed terminals 2, 3 into a continuity by a bimetal piece 4 at a temperature lower than a preset temperature, and a movable contact 5 and a fixed contact 3a into a discontinuity with the bimetal piece 4 reversed when the temperature exceeds the preset temperature. A lead piece having a connecting face opposite to an outer can 8a of the battery is arranged at the first fixed terminal 2 or the second fixed terminal 3, and an electrode of a positive thermistor 7 that holds the reverse of the bimetal piece 4 by being heated is connected to the connecting face of the lead piece.