PURPOSE: To enable the transplanter to surely supply seedlings one by one to a spare seedlings storing device in a seedling transplanting working car.

CONSTITUTION: Spare seedlings are supplied onto a seedling receiving conveyer 31 in a spare seedling storing device by a conveyer 62. A stopper 70 to the carried spare seedlings is provided at a carrying finishing end side of the conveyer 62. The seedling receiving conveyer 31 is controlled in rotation around an axial core X in an receiving attitude paralleling on a line to a conveyer 62 and a feeding in attitude paralleling on a line to a seedling supplying table 41 of the spare seedling storing device side. When the seedling receiving conveyer 31 is a seedling receiving attitude, an action of the stopper 70 is resolved and the conveyer 62 supplies seedlings to the seedling receiving conveyer 31, and when the seedling receiving conveyer 31 is not a seedling receiving attitude such as it is a feeding attitude, the stopper 70 acts to the conveyer 62 not to supply seedlings to the seedling receiving conveyer 31. Thus, the action of the stopper 70 is controlled to switch to possible and impossible.