PURPOSE: To carry in and out a parts between presses without using a positioning mechanism by transferring a work by the robot arranged between a work station and idle station by providing an idle stage between adjacent work stations.

CONSTITUTION: A press 1 is provided on work stations G2, G3 respectively, an idle stage 3 is provided therein and a press forming product 2 as a work is transferred in an arrow mark direction F from the work station G2 to G3. An unloading robot 4 and loading robot 5 are respectively provided upstream and downstream of the idle stage 3 do as to deviate each other from a line direction F. A press forming product 2 can be transferred to the work station G3 via the idle stage 3 from the station G2 without using a conveyor, etc., by controlling these robots 4, 5 with a robot control panel.