To provide a battery pack.

A battery pack includes: a first case; a second case coupled with the first case; a plurality of battery cells which are received between the first case and the second case and are positioned side-by-side; and a label comprising a first surface attached to an outer surface of the first case and a second surface attached to an outer surface of the second case. A side coupling portion of the first case and the second case forms an outwardly convex round shape, the label comprises an intermediate surface which encloses an outer circumferential surface of the side coupling portion, and the intermediate surface is formed continuous from the first surface and the second surface. Thus, area and thickness of a label-attached portion of a case on which a label is attached can be minimized, allowing a slim structure of a battery pack.