To provide a battery pack capable of easily securing reliability of mechanical strength of an outer package part, and to provide a method of manufacturing the same.

In the battery pack 1 with accessories 11, 16, 17 mounted on an electrode 5, 6 side of a unit cell 2, a pin 21 is protruded from the unit cell 2, a portion of the pin 21 is embedded into a concave part 20 formed at the unit cell 2, and the pin 21 is engaged with at least one of the accessories 11, 16, 17. With this, the accessory engaged with the pin can be prevented from moving in case of action of external force. Further, a portion of the pin is embedded into the concave part 20 formed at the unit cell 2, and the pin 21 can be fixed to the unit cell 2, thus the pin 21 can be easily mounted on the unit cell 2.