Printed-board supporting apparatus

A printed-board supporting apparatus includes a support pin that is attached to a pin-supporting table. An image of the support surface of the support pin is taken by a mark-image taking device, at a first position where a center of an image-take surface of the mark-image taking device is expected to coincide with a center of the support surface of the support pin. Another image of the support surface is taken at a second position where the center of the image-take surface is distant from the center of the support surface by a predetermined distance. At the second position, the image of the support surface is formed on the image-take surface at a position corresponding to the height of the support surface. Based on the position corresponding to the height of the support surface, the height of the support surface relative to the mark-image taking device is obtained.