PURPOSE: To minimize the line stop time by receiving a work on the second overhead conveyor onto a bogie with a lifter, running it synchronously with a floor conveyor, and transferring it to the floor conveyor in the transfer device of a car body production line.

CONSTITUTION: Car bodies Bb and Bc conveyed by the first overhead conveyor 2 are transferred to a slat conveyor 1 via a drop lifter 3 and a table lifter 4. A car body Ba conveyed by the second overhead conveyor 8 is mounted on the lifter table 21 of a bogie 10 by a lifter 11. The arm 7 of the drop lifter 3 is lifted and retreated, the table lifter 4 is lowered and retreated, the bogie 10 is run synchronously with the slat conveyor 1, the lifter 11 is lowered, and the car body Ba is transferred to the slat conveyor 1. The line stop time can be minimized.