To provide a developer filling device for filling only developer having appropriate magnetic characteristics, preventing foreign matter from getting mixed with the developer, thereby, capable of forming an image recorded with toner of high quality.

The developer filling device includes: a supply part 1 that supplies the developer D for forming a toner image by introducing an electrophotographic system; a conveying roller 2 rotatably held above the supply part 1, configured to sort and convey the developer D helically attracted by the generated magnetic force; a recovery part 3 configured to recover the developer D magnetically sorted by the conveying roller 2; and an attachment part 5 configured to attachably/detachably attach a container main body 4 that is filled with the developer D magnetically sorted and conveyed by the conveying roller 2.