A development device includes a development portion to develop a latent image formed on a latent image carrying member with developer including toner and carrier particles, a circulation unit to convey the developer collected from the development portion to a supplying unit in the development portion, the circulation unit including a container to store the developer, disposed upstream from the development portion in a direction in which the developer is circulated, and a first agitator provided inside the container, to agitate and mix the collected developer and fresh toner supplied to the container, the first agitator formed by multiple linear members.