A toner conveying device includes a first communication opening, a toner supply opening, a toner conveyance passage, an opening/closing member, and a moving member. The first communication opening communicates with a toner discharge outlet formed in a toner case in a state where the toner case is attached to a predetermined attachment position, the toner case including an operation portion. The toner conveyance passage connects the first communication opening to the toner supply opening. The opening/closing member moves between a closing position and an opening position. When the opening/closing member is at the closing position, the toner supply opening is closed, and when the opening/closing member is at the opening position, the toner supply opening is opened. The moving member is dislocated in conjunction with an operation of the operation portion in such a way as to move the opening/closing member from the closing position to the opening position.