To provide a front and rear sides of parts aligning device capable of rapidly and certainly aligning a direction of the front and rear sides of parts.

Parts 1b fed from a part feed port 35 are accommodated in a part accommodation part 22 radially provided on a ring part 21 intermittently rotated one by one such that a front and rear direction of the parts 1b is directed to the radial direction of the ring part 21 and the direction of the front and rear sides is detected by photoelectric sensors 38a, 38b. When the parts 1b detected as a direction faced to a front by the photoelectric sensors 38a, 38b arrive at a rotation position of the part accommodation part 22c and the parts 1b detected as the direction faced to a back arrive at a rotation position of the part accommodation part 22d, an air is fed from nozzles 39a, 39b respectively. The direction of the respective parts 1b can be rapidly and certainly aligned and lined up by discharging the parts 1b of the direction faced to a front to a part discharge port 36 through a connection passage 24 and the part accommodation part 22d and the parts 1b of the direction faced to a back to the part discharge port 36 from the part accommodation part 22d directly.