Transmission for use with motor and pedal

A transmission (100) for use in an electrically-driven bicycle and/or a scooter is disclosed, in which the transmission coupled with a motor (120) is embedded together with the motor in a hub of a rear or front wheel. The power generated from the motor or a pedal is outputted through a transmission device to a hub shell (140) of the wheel. The output of the motor which is subject to a reduction unit is used as the input of the transmission device (200). A one-way clutch (137) to which the power of a driver is received in a one-way rotation manner is prepared to the other side of the input of the transmission device, while the input of the transmission device is commonly used as a carrier for a series of planetary gears in the transmission device (200).