A toner cartridge used with an electrophotographic image forming apparatus includes a developing roller to develop an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner to supply roller supplying toner onto the developing roller, a guide member installed under the toner supplying roller to guide the toner to attach onto the surface of the toner supplying roller by a predetermined thickness, a hopper to store the toner supplied to the toner supplying roller, and an agitator rotatably installed on the hopper. A rotary shaft of the agitator is disposed in a position higher than an upper portion of the guide member.