To provide a marking device for a bolt and nut, a washer and a member that can quickly, simply and accurately mark a bolt and nut, a washer and a member surface despite a simple structure.

The marking device for a bolt and nut, a washer and a member marks a member surface 11a, a bolt point portion 12a projecting up from the member surface 11a, a nut 13 temporarily tightened on the bolt point portion 12a via a washer 14, and the washer 14. The marking device comprises a body case part 2 opening downward to accommodate a bolt 12, the nut 13 and the washer 14 and having a lower end opening edge 24 capable of butting against the member surface 11a, a movable marker part 3 disposed for movement relative to the body case part 2 to mark the bolt 12, the nut 13, the washer 14 and the member surface 11a, and an operating part 6 for moving the movable marker part 3.