The present invention relates to a part-time four-wheel drive device for a vehicle, comprising: a sleeve coupled to an outer circumferential surface of an input shaft into which power is input from a transmission, a first output shaft selectively connected to the input shaft through the sleeve, and a motor disposed in the vicinity of the sleeve And a gear unit for gear-coupling the sleeve and the motor and moving the sleeve in an axial direction with an output of the motor, wherein the input shaft and the first output shaft are selectively connected to the rear axle according to the movement of the sleeve. It transmits power to enable the vehicle to operate in four-wheel drive.
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