A waste toner conveying device includes a first conveying path configured to convey waste toner having paper powder at a low mixed ratio, which is stored in a first cleaning device, outside the first cleaning device, a second conveying path configured to convey second waste toner having a paper powder at a high mixed ration, which is stored in a second cleaning device, outside the second cleaning device, and at least one forwarding path configured to convey the first waste toner conveyed from the first cleaning device through the first conveying path and the second waste toner conveyed from the second cleaning device through the second conveying path are conveyed to a waste toner storage device. The at least one forwarding path is configured to convey the first waste toner conveyed from the first cleaning device through the first conveying path to the waste toner storage device via the second conveying path.