To provide a shaft force visual confirmation device capable of visually observing a degree of shaft force to recognize it precisely.

This shaft force visual confirmation device is constituted such that a ringlike elastic body 30 is arranged between a tightened body 50 and a nut 20 in a bolt 10 and the nut 20 tightening the tightened body 50 and a fixed width of an outer peripheral end part of the elastic body 30 is classified by color different from that on an inner peripheral side.