We measured diameter at breast height of 800 stems and their height from 29 tree species in a 6-ha plot of old-growth temperate deciduous forest established in the Ogawa Forest Reserve. An expanded allometric function was fit to these data, and specific parameters were estimated. The data and parameter estimates are provided as hardcopy tables and electronic materials. These data and estimates will be useful to establish management plans for forest stands of various species of deciduous trees.