A cover member engagement device and a portable terminal having a battery cover engagement structure using the same are provided, in which a battery mounting portion is formed on a rear surface of a housing of the portable terminal, engagement recesses are formed in both edges of the battery mounting portion, and engagement ribs are formed on a surface of a battery cover, for being engaged in the engagement recesses, wherein at least one first hook protruding from an inner side surface of at least one of the engagement ribs and at least one second hook protruding from an outer side surface of at least one of the engagement ribs are engaged with the housing.