To provide a fastening member and a bolt capable of being easily checked that it is fastened to a predetermined axial force without generating a refuse.

In the fastening member 1, a seat 4 of the fastening member 1 is seated on a seating surface 8 of a member 2 to be fastened to complete the fastening by being successively screwed to the member 2 to be fastened. A lip member 3 expanding radially outward and facing to the seating surface 8 direction of the member 2 to be fastened is provided in the circumference of the seat 4. The lip member 3 is deformed by fastening force on the seating surface 8 of the member to be fastened.