Developer replenishing device to transport developer from developer container, image forming apparatus including same, and conveyance device to transport powder or fluid from container

A developer replenishing device comprising:

• a container mount to hold a developer container to contain developer used in image formation;
• an installation completion detector to detect completion of installation of the developer container in the container mount;
• a containing portion to contain developer supplied from the developer container;
• a conveyance channel through which developer is transported from the developer container held in the container mount to the containing portion;
• and
• a conveyance pump to transport developer from the developer container through the conveyance channel to the containing portion,
• wherein the containing portion is replaceable and removably connected to the conveyance channel, and
• in a state in which the developer container is not held in the container mount according to a detection result by the installation completion detector, the conveyance pump transports developer from the conveyance channel to the containing portion.