A bolt supply device includes a slide plate inclined to a vertical direction; and a groove portion formed in the slide plate and having a width that allows passing of a screw portion of a bolt and prevents passing of a flange portion of the bolt. The groove portion includes a first groove configured such that an angle formed between a line extending in an up-down direction along the slide plate and the first groove is a first angle; and a second groove connected to a lower end of the first groove and configured such that an angle formed between the line extending in the up-down direction along the slide plate and the second groove is a second angle smaller than the first angle. The bolt take-out portion is set in the groove portion at a lower end or below the lower end of the second groove.