A solid sheet (10) has a first fiber layer (11) having a first surface (111) and a second surface (112) and a second fiber layer (12) having a first surface (121) and a second surface (122). The two layers are laminated so that the second surface (112) of the first fiber layer and the first surface (121) of the second fiber layer face each other. The solid sheet (10) forms multiple hollow bumps (20) projecting from the first fiber layer (11) in the direction away from the second fiber layer (12). The first fiber layer (11) and second fiber layer (12) are made from a nonwoven textile. The first fiber layer (11) includes a plurality of types of fibers. The plurality of types of fibers includes at least two types made from first fibers and second fibers. The first fibers and second fibers include a high melting-point component and low melting-point component, respectively, and the diameter ratio of the high melting-point component and low melting-point component differs.
