To provide a painting booth vertically circulating transporting mechanism by which carriage mobile efficiency can be raised by displaying excellent painting quality of an automobile body and further space-saving of a painting line can be attained.

A transportation conveyer 120 for painting which transports a carriage 110 for a painting booth only mounted with an automobile body W from a painting starting position P1 to a painting finishing position P2 and a conveyor 130 for returning the carriage which returns the carriage 110 for the painting booth only after delivering the automobile body W to a drying booth DB side at the painting finishing position P2 to the painting starting position P1 are respectively arranged at an upper area and a lower area within the painting booth PB to constitute the painting booth vertically circulating transporting mechanism 100.