A continuous speed change gear of the invention is adapted to output the rotational force of an input shaft to a driven shaft while continuously varying said force, and provided with an input shaft (10), a pivotable shaft (13) provided so that it can be turned independently of and concurrently with the input shaft (10) as the pivotable shaft crosses the input shaft at right angles thereto, a first bevel gear (11A) mounted unitarily on the input shaft (10), a second bevel gear (11B) mounted unitarily on the pivotable shaft (13) and meshed with the first bevel gear (11A), a third bevel gear (14D) mounted unitarily on the pivotable shaft (13), a driven shaft (15) provided on the opposite side of the input shaft (10) with respect to the pivotable shaft (13), a fourth bevel gear (14C) meshed with the third bevel gear (14D) and mounted unitarily on the driven shaft (15), a fifth bevel gear (14A) meshed with the third bevel gear (14D) and having a hollow sensor portion (17), a means for applying rotational resistance to the fifth bevel gear (14A), and a can-shaped carrier (16) provided so that it can be turned around the hollow sensor portion (17) and the driven shaft (15). An over-driven unit (3) is also provided so as to increase the rotation of the input shaft at a predetermined ratio.