PURPOSE: To provide a bolt and nut supply device of a simple structure by supplying bolts and nuts to a tightening machine from a stocker holding a plurality of pairs of bolts and nuts in rows through a delivery mechanism provided with the first and second moving mechanisms.

CONSTITUTION: When a driving motor 34e of the first moving mechanism 34 is driven, bolt and nut holding arms 30 and 32 are separated from each other, and a bolt and a nut 20 and 22 are attracted and fastened to the arms 30 and 32 by energizing a coil. Then, after the arms 30 and 32 moved to approach each other, they are opposed to a tightening of a tightening machine 16 and bolt arms 16c and 16d. After that, the arms 30 and 32 are separated from each other by driving of the driving motor 34e of the first moving mechanism 34, and the arms 30 and 32 are brought into contact with the tightening and bolt arms 16c and 16d. After power is disconnected, the bolt and nut 20 and 22 are fastened to the arms 16c and 16d of the tightening machine 16, the bolt and nut 20 and 22 are fitted into through-holes of a bolt box 12a by driving of driving jacks 16e and 16f. In addition, the bolt 20 and nut 22 are screwed by driving of a hydraulic motor 16h.