A battery pack including battery cells including a first end portion and a second end portion in a length direction thereof; a cell holder having a first surface through which portions of the first end portions are exposed in the length direction; a circuit board having a first surface through which the portions of the first end portions and a portion of the first surface of the cell holder are exposed; measurement members connecting the battery cells to the circuit board; and a photocurable adhesive surrounding the measurement members, wherein the first end portions, the first surface of the cell holder, and the first surface of the circuit board are arranged in a stepped manner at least partially exposed to an outside of the circuit board in the length direction of the battery cells and are at least partially covered by the photocurable adhesive.