A mail sorting and distributing transfer system, which smoothly conveys mail on a mail sorting line having a compound curve whose line is not in a plane, but is three-dimensional, whereby the mail can be reliably transferred to a conveyor basket and conveying power savings are achieved. The system 100 receives mail in a transfer basket 120 hung at an outer circumferential edge of a mail sorting and distributing turn table 110 and transfers the mail through a transfer port 122 to a conveyor basket 130, which circulates on a mail sorting line O. The conveyor basket 130 includes an inner circumferential side carriage 131 and an outer circumferential side carriage 132, which respectively travel on an inner circumferential side rail 142 and an outer circumferential side rail 143 of the mail sorting line O while hanging a basket body 133 by both sides in a carried state.