A development device used in an electrophotographic image forming apparatus, the development device comprising: a developer carrier configured to carry a developer and develop an electrostatic latent image; a supplying member configured to be arranged to form a nip portion with the developer carrier and supply the developer to the developer carrier; a development chamber in which the supplying member and the developer carrier are arranged, the development chamber being provided with a first space for storing the developer; a regulation member configured to regulate an amount of the developer carried on the developer carrier; a containing chamber configured to contain the developer; and a conveyance member configured to convey the developer contained in the containing chamber to the supplying member via an opening; and a wall separating the development chamber from the containing chamber, the wall being arranged under the opening in a state where the development device is attached to the electrophotographic image forming apparatus, wherein the developer carrier and the supplying member are configured to rotate such that the surface of the developer carrier at the nip portion moves from an upper end of the nip portion toward a lower end of the nip portion, and the surface of the supplying member at the nip portion moves from the upper end of the nip portion toward the lower end of the nip portion, characterized in that the first space is arranged above the nip portion and the containing chamber is arranged under the development chamber in the gravity direction in the state where the development device is attached to the electrophotographic image forming apparatus, and the development chamber is provided with a second space for storing the developer under the supplying member and, according to the rotation of the supplying member, the developer being stored in the second space is moved from the second space to the containing chamber via the opening. a developer carrier configured to carry a developer and develop an electrostatic latent image; a supplying member configured to be arranged to form a nip portion with the developer carrier and supply the developer to the developer carrier; a development chamber in which the supplying member and the developer carrier are arranged, the development chamber being provided with a first space for storing the developer; a regulation member configured to regulate an amount of the developer carried on the developer carrier; a containing chamber configured to contain the developer; and a conveyance member configured to convey the developer contained in the containing chamber to the supplying member via an opening; and a wall separating the development chamber from the containing chamber, the wall being arranged under the opening in a state where the development device is attached to the electrophotographic image forming apparatus, wherein the developer carrier and the supplying member are configured to rotate such that the surface of the developer carrier at the nip portion moves from an upper end of the nip portion toward a lower end of the nip portion, and the surface of the supplying member at the nip portion moves from the upper end of the nip portion toward the lower end of the nip portion, characterized in that the first space is arranged above the nip portion and the containing chamber is arranged under the development chamber in the gravity direction in the state where the development device is attached to the electrophotographic image forming apparatus, and the development chamber is provided with a second space for storing the developer under the supplying member and, according to the rotation of the supplying member, the developer being stored in the second space is moved from the second space to the containing chamber via the opening.