To provide the subject legs aiming at preventing each. pot from hanging down caused by bend of a raising seedling tray in use, and always keeping ventilation in the lower part of the pots in a good condition without damaging the seedling raising environment by the tray.

The auxiliary legs 10 are formed so as to provide a space 13 between the installation surface 12 to put the legs 2 of a raising seedling tray 1 thereon and the respective bottoms 4 of pots 3 of the raising seedling tray 1; wherein the auxiliary legs 10 are so designed that air holes are formed on the auxiliary leg bodies 16 formed so as to keep the above space 13 and also a fitment part 17 to be fitted into the hole 5 at the bottom 4 of each of the pots 3 is formed on one end 14 of each of the auxiliary leg bodies 16.