To prevent a first member 2 and a second member 3 from being relatively dislocated in the length direction of a long hole 21a, when fastening both members by inserting a bolt 41 into the long hole 21a formed in the first member 2 and an installation hole 31a formed in the second member 3.

This metal fitting prevents the first member 2 and the second member 3 from being relatively dislocated in the longitudinal direction of the long hole 21a when fastening the first member 2 formed with the long hole 21a and the second member 3 formed with the installation hole 31a by the bolt 41 and a nut 42, and includes a seat surface part 11 abutting on the first member 2 and forming an insertion hole 11a for inserting the bolt 41 and a fitting-in claw 13 formed by extending to the long hole 21a side from an end part in the longitudinal direction of the long hole 21a among the seat surface part 11 and fitted in the long hole 21a when fastening the first member 2 and the second member 3. A width of the fitting-in claw 13 is gradually formed in a narrow width toward the tip from the seat surface part 11 side, and a width on the seat surface 11 side is larger than a width in the short direction of the long hole 21a, and a tip part is smaller than the width in the short direction of the long hole 21a.