the present invention provides a bonding device and a bonding method with a high operation ratio by solving the problems of conventional techniques . in the present invention , a collet holder grasping a used collet is inserted from a first opening portion with the upper face open ; the used collet is engaged with first engagement portions provided at the first opening portion of a discarding unit ; the used collet is removed from the collet holder to be discarded by lifting the collet holder ; the collet holder is inserted from a second opening portion with the upper face open of a supplying unit ; the uppermost unused collet among plural stacked unused collets is grasped ; and the uppermost unused collet ejected from the first opening portion is attached to the collet holder .