A toner container installed in an image forming apparatus, the toner container including a toner container main body having a predetermined length and which accommodates toner, a mixer which stirs the toner in the toner container main body, a discharge port through which the toner in the toner container main body is discharged from the toner container main body, a screw having one end projected from one end surface of the toner container main body, the screw being rotated to convey the toner from the toner container main body to the discharge port, a coupling portion provided at the one end of the screw and rotated by a driving portion provided in the image forming apparatus, and a protruding portion provided on an outer peripheral surface of the coupling portion.