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1. A transmission apparatus comprising: a transmission including a plurality of gear pairs having different transmission gear ratios for transmitting power; and a variable speed drive mechanism that changes and shifts the plurality of gear pairs by movement of a shift fork guided by a shift drum when the shift drum is rotated by being driven by a shift motor, wherein the variable speed drive mechanism includes a drum center that is provided at an end portion of the shift drum and is rotated together with the shift drum, a stopper mechanism that positions the drum center at an angular position of each gear position, a shift driven gear that is rotated in synchronization with the shift motor and is disposed to be engageable with the drum center, a shift spindle that is rotated in synchronization with the shift motor and integrally has a shift drive gear that meshes with the shift driven gear at a predetermined reduction ratio, and a configuration in which a drive engagement portion formed in the shift driven gear and a driven engagement portion formed in the drum center are engageable with each other in a circumferential direction with a play angle between the drive engagement portion and the driven engagement portion in the circumferential direction, the variable speed drive mechanism including a drum angle sensor that detects a rotation angle of the shift drum, a spindle angle sensor that detects a rotation angle of the shift spindle, and a shift control device that controls driving of the shift motor based on a control value for rotating the shift driven gear to a target position, and the shift control device corrects and learns the control value based on a difference angle between a drum shaft conversion spindle integration angle obtained by converting a detected spindle angle detected by the spindle angle sensor into a drum angle and a detected drum angle detected by the drum angle sensor, over a predetermined learning time from when the shift motor is driven, and the drive engagement portion of the shift driven gear reduces the play angle to abut on the driven engagement portion of the drum center to accompany the driven engagement portion.
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