Disclosed is the transmission having the deceleration or the structure of being accelerated the output is comprised of the same direction as the kill time in the forward rotation the motive power of motor is rotated reversly. The transmission for motor according to the present invention comprises the normal motor having the driving shaft, and the fixed axis extended to both sides of the output cover, which is informed of the rotatory power of motor while circling around the outside of motor and is rotated and output cover. And the transmission formed between the driving shaft and the output cover further are included. According to the transmission is the rotational direction of the driving shaft, while being selectively connected and decelerating as the constant rate it outputs to the fixed direction. When the driving shaft is rotate forward the driving shaft and output cover are linked directly and it consists of the regular direction with the constant rate output. The reduction planetary gear is engaged in the reverse rotation time between the driving shaft and output cover and the driving shaft forces in the regular direction with deceleration output. the normal motor having the driving shaft, and both sides of the output cover, are included. And while the transmission being selectively connected according to the rotational direction of the driving shaft and accelerating as the constant rate the transmission for the motor printed out is provided to the fixed direction. Both sides of the output cover, is informed of the rotatory power of motor while circling around the outside of motor and is rotated and output cover the transmission formed between the extended fixed axis, and driving shaft and the output cover.