A toner cartridge includes: a housing to accommodate toner and including a fastening boss at a front end; a front cover including a fastening hole aligned with the fastening boss; a fastening member including a fastening portion and a head portion, the fastening portion configured to pass through the fastening hole and be fastened to the fastening boss to couple the front cover to the housing; and a separating portion to allow the fastening hole to be separated from the head portion of the fastening member by an external force acting on the front cover.