An assembly comprising a mounting member (10, 210, 310) and an abutment member (30, 230), wherein the mounting member (10, 210, 310) is for mounting a wall material to a structural body and comprises: a substrate portion that can be fixed to the structural body; a wall portion (12, 212) that protrudes from one side edge of the substrate portion relative to the substrate portion; a protruding portion (13, 213, 313) that protrudes from another side edge side of the substrate portion to the same side as the wall portion (12, 212), and that has a length of protrusion from the substrate portion shorter than a length of protrusion of the wall portion (12, 212) from the substrate portion; a supporting portion that approaches the protruding portion (13, 213, 313) by extending from a leading edge of the wall portion (12, 212) so as to be opposed to the substrate portion; a first locking portion that protrudes from the supporting portion toward a side opposite to the substrate portion, and that is bent to the wall portion side; and a second locking portion that protrudes from the supporting portion toward the side opposite to the substrate portion, and that is bent to the protruding portion side, wherein the mounting member (10, 210, 310) can be equipped with the abutment member (30, 230), and wherein the abutment member (30, 230) includes a mounting portion (31, 231U, 231D) that can be fixed onto the substrate portion and/or onto substantially the same plane as the substrate portion from the protruding portion side, an erect piece (32, 232U, 232D) that is provided erecting in a direction intersecting the mounting portion (31, 231U, 231D), and that protrudes toward the side opposite to the substrate portion, and a clamping portion (33, 233) that is formed as a single piece with the mounting portion (31, 231U, 231D), and that is capable of clamping the protruding portion from a direction intersecting the substrate portion. a substrate portion that can be fixed to the structural body; a wall portion (12, 212) that protrudes from one side edge of the substrate portion relative to the substrate portion; a protruding portion (13, 213, 313) that protrudes from another side edge side of the substrate portion to the same side as the wall portion (12, 212), and that has a length of protrusion from the substrate portion shorter than a length of protrusion of the wall portion (12, 212) from the substrate portion; a supporting portion that approaches the protruding portion (13, 213, 313) by extending from a leading edge of the wall portion (12, 212) so as to be opposed to the substrate portion; a first locking portion that protrudes from the supporting portion toward a side opposite to the substrate portion, and that is bent to the wall portion side; and a second locking portion that protrudes from the supporting portion toward the side opposite to the substrate portion, and that is bent to the protruding portion side, wherein the mounting member (10, 210, 310) can be equipped with the abutment member (30, 230), and wherein the abutment member (30, 230) includes a mounting portion (31, 231U, 231D) that can be fixed onto the substrate portion and/or onto substantially the same plane as the substrate portion from the protruding portion side, an erect piece (32, 232U, 232D) that is provided erecting in a direction intersecting the mounting portion (31, 231U, 231D), and that protrudes toward the side opposite to the substrate portion, and a clamping portion (33, 233) that is formed as a single piece with the mounting portion (31, 231U, 231D), and that is capable of clamping the protruding portion from a direction intersecting the substrate portion.