A development unit according to an embodiment may include a developer carrier configured to carry developer on a surface thereof; a layer regulation member being elongate in a direction and provided facing the developer carrier; and a frame supporting the developer carrier and the layer regulation member. The layer regulation member comprises a metal blade that contacts the developer carrier and a support member attached to the frame and supporting the blade. A free length of the blade at an end portion in a longitudinal direction of the layer regulation member is shorter than a free length of the blade at a center portion in the longitudinal direction of the layer regulation member.