Provided is an attaching device that can convey a component, such as a nut, to a portion to be welded without using an air cylinder.The present invention provides an attaching device (100) that attaches a nut (240) to a bracket (230). The attaching device (100) has a component feeding part (10) that stores the nut therein, a welding part (40) that welds the nut to the bracket by using electrodes (41, 42), a conveying part (20) that conveys the nut stored in the component feeding part to a position where the nut is to be attached to the bracket, and a feeding head (30) that temporarily positioned between the electrodes (41, 42) and that places the nut conveyed from the conveying part on the lower electrode of the pair of electrodes.