A developer replenishment device includes a developer transport member, a joint member, and an elastic member. The developer transport member transports a developer to a developing device. The joint member is attached to an end portion of the developer transport member on a side of the developing device so as to be relatively displaceable with respect to the developer transport member to be joined to the developing device so as to be able to replenish the developing device with the developer. The elastic member is interposed between the developer transport member and the joint member, and includes a guide hole that guides the developer from the developer transport member to the joint member.