The specific Young's modulus, Es/(ρs/ρf), was introduced to experimentally evaluate the effectiveness of the stress transfer factor of interfiber bonding in handmade pulpsheet. As a result of the application of this modulus to calendered sheet, no additional interfiber bonding was proved to be formed, although the Young's modulus calculated by the conventional method increased with decreasing thickness. Dimension of the specific Young's modulus, Pa, provides a logical approach in mechanical discussion of paper. A further investigation is needed to study the quantitative treatment of the elastic properties of paper.