A multilayer resin sheet comprising: a resin composition layer that comprises a thermosetting resin and a filler; and an adhesive layer that is disposed on at least one surface of the resin composition layer, the adhesive layer having an arithmetic average surface roughness Ra of 1.5 μm or less at a surface that does not face the resin composition layer, wherein the filler comprises a boron nitride filler, the boron nitride filler comprises a boron nitride filler having a volume average particle diameter of from 10 μm to 100 μm, the adhesive layer is disposed on a surface of the resin composition layer that has an arithmetic average surface roughness Ra of from 1.5 μm to 4.0 μm, the adhesive layer has an average thickness of from 6 μm to 15 μm, and the resin composition layer comprises the filler of from 40 to 85% by volume in a total solid content of the resin composition layer, the arithmetic average surface roughness Ra of the adhesive layer and the arithmetic average surface roughness Ra of the resin composition layer prior to providing the adhesive layer being measured with a surface roughness measuring instrument as indicated in the description, and the volume average particle diameter of the boron nitride filler being measured by laser diffractometry, wherein the measurement is performed with a laser diffraction scattering particle size distribution analyzer using a filler that is separated from the resin composition by extraction with an organic solvent, nitric acid, or aqua regia, and dispersed thoroughly with an ultrasonic wave disperser, measuring the particle size distribution of the dispersion and determining the volume average particle diameter of the filler. a resin composition layer that comprises a thermosetting resin and a filler; and an adhesive layer that is disposed on at least one surface of the resin composition layer, the adhesive layer having an arithmetic average surface roughness Ra of 1.5 μm or less at a surface that does not face the resin composition layer, wherein the filler comprises a boron nitride filler, the boron nitride filler comprises a boron nitride filler having a volume average particle diameter of from 10 μm to 100 μm, the adhesive layer is disposed on a surface of the resin composition layer that has an arithmetic average surface roughness Ra of from 1.5 μm to 4.0 μm, the adhesive layer has an average thickness of from 6 μm to 15 μm, and the resin composition layer comprises the filler of from 40 to 85% by volume in a total solid content of the resin composition layer, the arithmetic average surface roughness Ra of the adhesive layer and the arithmetic average surface roughness Ra of the resin composition layer prior to providing the adhesive layer being measured with a surface roughness measuring instrument as indicated in the description, and the volume average particle diameter of the boron nitride filler being measured by laser diffractometry, wherein the measurement is performed with a laser diffraction scattering particle size distribution analyzer using a filler that is separated from the resin composition by extraction with an organic solvent, nitric acid, or aqua regia, and dispersed thoroughly with an ultrasonic wave disperser, measuring the particle size distribution of the dispersion and determining the volume average particle diameter of the filler.