as described above this reduces the time and labor of machining and makes it less likely that vane shaft 3 a will seize in the vane shaft holes formed by inner base unit 2 a and indentations 2 c 2 in the prior art vane adjustment mechanism 51 to control the quantity of exhaust gas vane shafts 53 a in nozzle vane units 53 are linear and they are riveted to levers 54 thus vane shafts 53 a nozzle vane units 53 and levers 54 in prior art mechanisms 51 to control the quantity of exhaust gas required numerous parts this affected both the parts count and the number of assembly processes also just as was described above the machining of the shafts required a great deal of precision increasing the time labor and cost of production in contrast to produce vane lever unit 3 in the vane adjustment mechanism 1 to control the quantity of exhaust gas of this invention each vane shaft 3 a connector 3 b and protrusion 3 c in vane 3 a and lever 3 b can be forged as a single piece thus the mechanism 1 to control the quantity of exhaust gas of this invention requires fewer parts and as a result fewer assembly processes the task of adjusting the angle at which lever 3 b is mounted to vane 3 a can be eliminated thus significantly.