Abstract: A hollow board includes a core layer, a first skin layer, and a second skin layer. The core layer is made of plastic and includes a first surface, a second surface, and partition walls that define cells. The first skin layer is stacked on the first surface of the core layer. The second skin layer is stacked on the second surface of the core layer. The board includes side edge including a compressed portion in which the core layer is compressed in a thickness direction, and an end face formed by bending at least one of the first skin layer and the second skin layer toward the other skin layer at the side edge. The compressed portion is provided between the first skin layer and the second skin layer at the end face. The inclination angle of the end face is greater than or equal to 70 degrees.