Provided is a resin material for forming an underlayer film which is used to form a resist underlayer film used in a multi-layer resist process, the resin material including a cyclic olefin polymer (I), in which a temperature at an intersection between a storage modulus (G′) curve and a loss modulus (G″) curve in a solid viscoelasticity of the resin material for forming an underlayer film which is as measured under conditions of a measurement temperature range of 30° C. to 300° C., a heating rate of 3° C./min, and a frequency of 1 Hz in a nitrogen atmosphere in a shear mode using a rheometer is higher than or equal to 40° C. and lower than or equal to 200°.