Wall structure for building, attachment apparatus, and board material construction method

Provided are a wall structure for a building, an attachment apparatus, and a board material construction method, according to which construction is simple and fast, and a board material can be stably supported. A bracket includes: a first portion 110; a second portion 120; a first side wall portion 101 that extends continuously from at least a portion of one side edge 111 of the first portion 110 to at least a portion of one side edge 121 of the second portion 120, and protrudes toward a narrow angle α1 side; a second side wall portion 102 that extends continuously from at least a portion of another side edge 112 of the first portion 110 to at least a portion of another side edge 122 of the second portion 120, and protrudes toward the narrow angle α1; and a mounting portion 125 that is provided on the second portion 120. A first support body 30 includes: a first joining portion 31 that is to be mounted on the mounting surface 126 of the mounting portion 125; and a second joining portion 32. A fastening member includes a first drill screw 91 that penetrates through and fastens the mounting portion 125 and the first joining portion 31 to each other.