Cap cover and battery pack including the same

A cap cover and a battery pack including the cap cover are provided. The cap cover includes: a first plate which is formed in a first direction; a second plate which is formed in a second direction; and a third plate which is formed in a third direction. The first and third plates have a step difference due to the second plate and cover upper surfaces of a plurality of battery cells arranged to have a step difference, and the second plate covers a side exposed through the step difference of the battery cells.