A driving unit for use in an electric assist bicycle, comprising: a crankshaft; a motor; and a transmission shaft extending parallel to a central axis of the crankshaft, the motor including: a rotor; an output shaft configured to rotate together with the rotor and extending parallel to the central axis of the crankshaft; and an output gear located on the output shaft, the driving unit further comprising: a first transmission gear located on the transmission shaft and configured to engage the output gear, the first transmission gear including more cogs than the output gear does; a second transmission gear located on the transmission shaft; a driven gear located on the crankshaft and configured to engage the second transmission gear, the driven gear including more cogs than the second transmission gear does; and a plurality of bearings (78L,78R) configured to support the output shaft, the output shaft being rotatable around a central axis of the output shaft, wherein the plurality of bearings include a first bearing located at the same position as the second transmission gear as measured in an axial direction of the crankshaft, characterized in that the first bearing is a bearing located adjacent an end of the output gear opposite an end thereof adjacent the rotor as measured in an axial direction of the output shaft. a crankshaft; a motor; and a transmission shaft extending parallel to a central axis of the crankshaft, the motor including: a rotor; an output shaft configured to rotate together with the rotor and extending parallel to the central axis of the crankshaft; and an output gear located on the output shaft, the driving unit further comprising: a first transmission gear located on the transmission shaft and configured to engage the output gear, the first transmission gear including more cogs than the output gear does; a second transmission gear located on the transmission shaft; a driven gear located on the crankshaft and configured to engage the second transmission gear, the driven gear including more cogs than the second transmission gear does; and a plurality of bearings (78L,78R) configured to support the output shaft, the output shaft being rotatable around a central axis of the output shaft, wherein the plurality of bearings include a first bearing located at the same position as the second transmission gear as measured in an axial direction of the crankshaft, characterized in that the first bearing is a bearing located adjacent an end of the output gear opposite an end thereof adjacent the rotor as measured in an axial direction of the output shaft. a rotor; an output shaft configured to rotate together with the rotor and extending parallel to the central axis of the crankshaft; and an output gear located on the output shaft, the driving unit further comprising: a first transmission gear located on the transmission shaft and configured to engage the output gear, the first transmission gear including more cogs than the output gear does; a second transmission gear located on the transmission shaft; a driven gear located on the crankshaft and configured to engage the second transmission gear, the driven gear including more cogs than the second transmission gear does; and a plurality of bearings (78L,78R) configured to support the output shaft, the output shaft being rotatable around a central axis of the output shaft, wherein the plurality of bearings include a first bearing located at the same position as the second transmission gear as measured in an axial direction of the crankshaft, characterized in that the first bearing is a bearing located adjacent an end of the output gear opposite an end thereof adjacent the rotor as measured in an axial direction of the output shaft. a first transmission gear located on the transmission shaft and configured to engage the output gear, the first transmission gear including more cogs than the output gear does; a second transmission gear located on the transmission shaft; a driven gear located on the crankshaft and configured to engage the second transmission gear, the driven gear including more cogs than the second transmission gear does; and a plurality of bearings (78L,78R) configured to support the output shaft, the output shaft being rotatable around a central axis of the output shaft, wherein the plurality of bearings include a first bearing located at the same position as the second transmission gear as measured in an axial direction of the crankshaft, characterized in that the first bearing is a bearing located adjacent an end of the output gear opposite an end thereof adjacent the rotor as measured in an axial direction of the output shaft.