The present invention relates to a power transmission device (1) and an image forming apparatus (1000) having the same that is capable of reliably transmitting intermittent power to a driven component from a driving source. The power transmission device includes a shaft (110), a first intermittent gear (120) to receive power from the driving source (83) and to rotate on the shaft, a second intermittent gear (130) arranged so as to move between a first position in which the second intermittent gear is connected to the first intermittent gear along an axial direction of the shaft and a second position in which the second intermittent gear is disconnected from the first intermittent gear, a sliding unit (140) arranged so as to slide along the shaft and to move the second intermittent gear in the axial direction of the shaft, and a driving unit (150) to drive the sliding unit.