The growth stress accumulated in the stem during tree growth is released when sawing logs, which causes warp in the sawn lumber. However, the wood properties related with the residual-stress and warp are not identified. If the related wood properties are identified, it would be possible to predict the warp degree before sawing. In this study, flitches were ripped into the inner lumber and the outer lumber, and the relationship between wood properties and bow of lumber was studied using sugi (Cryptomeria japonica). The bow was significantly correlated with the moduli of elasticity of log and of the inner lumber, but not with that of the outer lumber. The modulus of elasticity of the core of log, which varies largely among trees within sugi, has a possibility to predict warp due to the release of growth stress. Furthermore, the bow increased by air-drying, and the increase was larger for the inner lumber. It might have been caused by a very slight long-term relaxation of internal residual-stress.