The present invention relates to a circuit board carrier including a carrier sliding between a conveyor and a holder disposed at the lower part of a main machine. The carrier includes a sliding rail disposed at the top of a main machine above the conveyor and the holder; a sliding base being on the sliding rail by means of a sliding recess thereof; a sliding rod disposed above the sliding base and being vertically spaced to the sliding rail; a sliding seat being slid on the sliding rod by means of a sliding piece and having a shaft post at the top thereof; a pivot sleeve pivoted on the shaft post of the sliding seat by means of a bearing thereof and having a connection groove; a turning arm, one end of which is connected to the connection groove of the pivot sleeve while the other end thereof is connected to a motor and a driving axle of a reduction machine; and a suction unit installed under the sliding base. Accordingly, the circuit board can be conveyed in a manner of simple harmony motion to reach a stable conveyance.