An angle adjustment metal fitting comprising: a first member including a rotation receiving portion having a pair of opposing side wall portions and, the rotation receiving portion having a main shaft and an auxiliary shaft inserted in parallel to each other while being separated by a predetermined distance; a second member including a rotating portion having a gear portion and an arcuate surface portion continuous to the gear portion the second member being provided between the side wall portions and of the first member the rotating portion being supported to be rotatable about the main shaft; a claw member having an inward surface of a control receiving portion extending from a claw member main body, provided with a toothed surface including a plurality of claw portions arranged side by side, the claw member being rotatably supported by the auxiliary shaft of the first member; a spring member that is attached in the first member and applies biasing force for rotating the claw member toward the second member; and a claw control member that includes a first control portion extending from a claw control member main body, is rotatably supported by the main shaft, and is capable of rotating together with the second member, wherein the claw control member has a position restricted so as not to rotate together while the second member relatively rotates in a folding direction, and a meshing state between the gear portion of the second member and the toothed surface of the claw member is released when the toothed surface of the claw member climbs over the arcuate surface portion of the rotating portion, while the second member then relatively rotates in an unfolding direction, the first control portion of the claw control member that rotates together with the second member restricts a position of the claw member, and the toothed surface of the claw member has a position restricted so as not to mesh with the gear portion of the second member, and when the second member is then operated to be relatively rotated by a predetermined small angle in the folding direction, the position of the claw control member that rotates together with the second member is restricted whereas the restriction of the position of the claw member by the claw control member is released, to make the toothed surface of the claw member mesh with the gear portion of the second member to restrict the relative rotation of the second member in the unfolding direction. a first member including a rotation receiving portion having a pair of opposing side wall portions and, the rotation receiving portion having a main shaft and an auxiliary shaft inserted in parallel to each other while being separated by a predetermined distance; a second member including a rotating portion having a gear portion and an arcuate surface portion continuous to the gear portion the second member being provided between the side wall portions and of the first member the rotating portion being supported to be rotatable about the main shaft; a claw member having an inward surface of a control receiving portion extending from a claw member main body, provided with a toothed surface including a plurality of claw portions arranged side by side, the claw member being rotatably supported by the auxiliary shaft of the first member; a spring member that is attached in the first member and applies biasing force for rotating the claw member toward the second member; and a claw control member that includes a first control portion extending from a claw control member main body, is rotatably supported by the main shaft, and is capable of rotating together with the second member, wherein the claw control member has a position restricted so as not to rotate together while the second member relatively rotates in a folding direction, and a meshing state between the gear portion of the second member and the toothed surface of the claw member is released when the toothed surface of the claw member climbs over the arcuate surface portion of the rotating portion, while the second member then relatively rotates in an unfolding direction, the first control portion of the claw control member that rotates together with the second member restricts a position of the claw member, and the toothed surface of the claw member has a position restricted so as not to mesh with the gear portion of the second member, and when the second member is then operated to be relatively rotated by a predetermined small angle in the folding direction, the position of the claw control member that rotates together with the second member is restricted whereas the restriction of the position of the claw member by the claw control member is released, to make the toothed surface of the claw member mesh with the gear portion of the second member to restrict the relative rotation of the second member in the unfolding direction.