Abstract: A pallet transferring apparatus of a horizontal type machine tool according to the present invention includes: a carrier transferring a pallet and having cam guide surfaces on both sides; a servo motor; a decelerator decelerating rotational force received from the servo motor and increasing torque; a pinion converting the rotational force into linear reciprocation movement of the carrier when the pinion is installed on the side of the carrier and receives the rotational force; a rack engaging with the pinion and transferring the rotational force received from the decelerator to the pinion; and a cam follower engaging with the cam guide surface of the carrier to guide forward and backward reciprocation transferring of the carrier.