Patent ID: 8862028

Claim:
An image formation unit comprising: a developer container containing developer; an image formation device configured to form a developer image using the developer; a first engagement part provided at the image formation device; a second engagement part movably provided at the developer container, the second engagement part being movable between an unengaged position and an engaged position with respect to the first engagement part; a regulation part movably provided at the developer container such that the second engagement part and the regulation part move together; and a regulation member fixed to the image formation device and configured, when the second engagement part is in the engaged position after the second engagement part is moved from the unengaged portion to the engaged position, to come into contact with the regulation part and thereby regulate movement of the second engagement part, wherein the regulation member is formed of a folded plate member such that the regulation member includes: an elastic portion configured to come into contact with the developer container; and a stationary portion fixed to the image formation device.