To provide an agitating shaft without yielding a play at a joining part of a main shaft with a joint shaft.

This agitating shaft of a rotary drum type tea leaf steaming machine is constituted by forming a joint shaft 6 of the agitating shaft 4 constituted as joining the joining end of the main shaft 5 with that of the joining shaft 6 by mounting joining plates 51, 61 each and fixing them with bolts 62, with a pipe material, mounting a joining projection 8 fitting with the joint shaft 6 at the end of the main shaft 5 and further screwing a female screw thereon for inserting the fixing rod 9 into the rear end of the joint shaft 6 for screwing in with the above female screw.