To provide an article transfer system capable of carrying a cargo from a truck even if an in-vehicle battery is weakened in electricity.

Since a sensor 29 for detecting speeds of in-vehicle conveyors 25 and 26 is arranged at the aboveground conveyor 30 side, even if the in-vehicle conveyors 25 and 26 cannot be driven by in-vehicle driving sources 27 and 28 when the in-vehicle battery 85 being a power source of the in-vehicle conveyors 25 and 26 is weakened in electricity, the in-vehicle conveyors 25 and 26 are moved manually or forcibly by a vehicle outside (aboveground side) power source, and a speed of an aboveground conveyor 30 can be synchronized with a speed of the forcibly driven in-vehicle conveyor 25 or 26.