Alignment device

An alignment device that aligns a second workpiece with a first workpiece arranged on a work surface while bringing the second workpiece close to the first workpiece, the second work piece being arranged away from the first workpiece in a first direction intersecting the work surface, the alignment device comprising:

• a holding device capable of holding the second workpiece;
• a moving device that moves the holding device toward the first workpiece;
• a mirror member capable of reflecting the second workpiece, the mirror member being arranged adjacent to the first workpiece in a second direction intersecting the first direction;
• an image sensor arranged to be able to simultaneously and continuously capture the first workpiece and a mirror image of the second workpiece reflected on the mirror member when the holding device in a state of holding the second workpiece is moved toward the first workpiece by the moving device;
• and
• a control device that calculates a position of the second workpiece with respect to the first workpiece based on the first workpiece and the mirror image of the second workpiece, which are captured by the image sensor, and performs feedback control of the moving device based on the calculated position of the second workpiece to align the second workpiece with the first workpiece.