It is a subject to provide a workpiece conveying device capable of linearly conveying a workpiece with a light-weight and simple configuration. The present invention is a workpiece conveying device 100 for conveying a workpiece W, the workpiece conveying device 100 comprising a main body portion 10; a rail portion 1 mounted to an upper portion of the main body portion 10; a guide portion 1a slidable along the rail portion 1; an arm 3 in which a first pivotally attaching portion 3b at the upper end thereof is pivotally attached to the guide portion 1a; a holding means 4 which is mounted to a second shall 3a at a lower end of the arm 3 and which can hold the workpiece W; an auxiliary arm 20 mounted to a first shaft 2b of the main body portion 10 to be rotatable; a slider portion 2a slidable along the auxiliary arm 20; and servomotors for driving the auxiliary arm 20, wherein a second pivotally attaching portion 3c at approximately a center of the arm 3 is pivotally attached to the slider portion 2a.