A building material having a convex part formed on a front surface thereof, the convex part including a first lateral surface part (81 A1) and a second lateral surface part corresponding to the first lateral surface part, wherein the building material is formed from a mixture containing a hydraulic material, an admixture, and a plant-based reinforcing material, the plant-based reinforcing material at least in the convex part is distributed in the mixture with the hydraulic material and the admixture attached to the plant-based reinforcing material, a distribution of the plant-based reinforcing material in the first lateral surface part and a distribution of the plant-based reinforcing material in the second lateral surface part are substantially the same, and the building material has a first surface layer, a first core layer formed on the first surface layer, a second core layer formed on the first core layer, and a second surface layer formed on the second core layer, and the first core layer is formed from powder raw materials having sizes that are relatively smaller than those of the second core layer, wherein the two core layers (6A, 6) are stacked upon each other on inner sides of the two respective surface layers, and wherein the two respective surface layers are front and rear layers; wherein the convex part includes a first edge part ( 31B11) that is an edge part of the first lateral surface part and a second edge part ( 31B21) that is an edge part of the second lateral surface part and that corresponds to the first edge part (31B11), and a distribution of holes formed in the first edge part ( 31B11) and a distribution of holes formed in the second edge part ( 31B21) are substantially the same. the building material is formed from a mixture containing a hydraulic material, an admixture, and a plant-based reinforcing material, the plant-based reinforcing material at least in the convex part is distributed in the mixture with the hydraulic material and the admixture attached to the plant-based reinforcing material, a distribution of the plant-based reinforcing material in the first lateral surface part and a distribution of the plant-based reinforcing material in the second lateral surface part are substantially the same, and the building material has a first surface layer, a first core layer formed on the first surface layer, a second core layer formed on the first core layer, and a second surface layer formed on the second core layer, and the first core layer is formed from powder raw materials having sizes that are relatively smaller than those of the second core layer, wherein the two core layers (6A, 6) are stacked upon each other on inner sides of the two respective surface layers, and wherein the two respective surface layers are front and rear layers; wherein the convex part includes a first edge part ( 31B11) that is an edge part of the first lateral surface part and a second edge part ( 31B21) that is an edge part of the second lateral surface part and that corresponds to the first edge part (31B11), and a distribution of holes formed in the first edge part ( 31B11) and a distribution of holes formed in the second edge part ( 31B21) are substantially the same.