PURPOSE: To perform simple executin of a work even at a limited work execut ing place by a method wherein a pallet is simply and runnably arranged between stays for elevation.

CONSTITUTION: After stays 4 for elevation are erected on both sides of a foundation surface 2 at a site, a pallet 3 in which upper and lower guide rollers 5 and 6 a motor 9 are previously incorporated at a factory is lifte by means of a crane. The upper end of guide groove 33 of the stay 4 for elevation is positioned facing the upper and lower guide rollers 5 and 6. By lowering the pallet 3 from the state, the upper and lower guide rollers 5 and 6 are runnably inserted through the opening of the upper end of the guide groove 33 in the guide groove 33, and pallet 3 is elevatably attached to the stays 4 for elevation. After the pallet 3 vertically elevatably mounted, a chain 7 for elevation is attached the stay 4 for elevation and the chain 7 for elevation is geared with a drive sprocket 8.