To efficiently conduct position adjustment according to the kind of a work positioning member 32 on a carriage 3 in a working line in which the carriage 3 emptied by unloading of a work W in an unloading station ST6 at the terminal of a working running passage 1 is transferred to a sending back passage 2 with an unloading side transfer means 42, the carriage 3 sent back through the sending back passage 2 is transferred to a loading station ST0 at the starting end of the working running passage 1 with a loading side transfer means 41, and the work W is loaded on the carriage 3.

A position adjusting device 9 for adjusting the position of the work positioning member 32 is mounted on the loading side transfer means 41, and adjusting work is conducted with a position adjusting device 9 during the transfer work of the carriage 3 to the loading station ST0.