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 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 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. <EOS>