PROBLEM TO BE SOLVED: To facilitate the operation works for growing seedlings in seedling- growing vessels. SOLUTION: In this device that treats preliminarily seed-sown seedling- growing vessels, a stacking device 16 that stacks the seedling-growing vessels A in the vertical direction is linked on the end side of a transfer table 1 and the transferring part 38 is linked to the stacking device 16. The transferring part 38 comprises a lifting apparatus 40 equipped with a machine frame 41 that is freely movable on a rail 39 in the crossing direction to that of a conveyer 37 of a receiving table 35 and with a lift arm 46 that receives the stacked seedling vessels A from the conveyer 37 and goes up and down to the machine frame 41 and a pallets-loading cart 61 that is freely movable on a rail 60 crossing the moving direction of the lifting apparatus 40, has a width for the lift arm 46 enough to be inserted and can receive pallets 63 each having a upper- projecting box-receiving part 64.
