Battery pack including a plurality of unit cells

A battery pack (100) including a plurality of unit cells (110), a case (120) accommodating the plurality of unit cells (110), and a first insulation structure (170) covering a first external surface of the case. A plurality of first guide pins (132b) project from the first external surface of the case (120). A plurality of first coupling holes (171) into which the first guide pins (132b) are respectively inserted is formed in the first insulation structure (170).