To provide a nut having a torque confirmation function, in which it can be surely determined whether or not a tightening state of a bolt with a nut is good, by visual confirmation, in tightening work using a general tool without using a torque wrench.

A nut having a torque confirmation function includes: a nut body 2; at least two recess portions 10 formed to a tightening face 3 of the nut body; press-out parts 15, 25a respectively communicating to the recess portions, and opened to an outer face of the nut body; soft filling members 20 filled in the recess portions; and pressing members 25 made of hard metal, a part of which is fitted into each recess portion and the other part of which is projected from the tightening face. When the pressing member is pressed into the recess portion, a part of the filling member is pressed out of the press-out parts to be displayed.