Fagus crenata is widely distributed from Kyushu to Hokkaido in Japan and exhibits genetic and phenotypic differentiation between populations along the Sea of Japan and Pacific sides of Japan. However, it remains unclear about geographic variation in wood characteristics of the species. Here we aimed to compare the leaf traits and wood characteristics between F. crenata populations. One hundred and eighty mature trees were sampled at the nine sites located widely within the range of the species. We collected one hundred fallen leaves and an increment core from each trees in the populations to measure leaf morphological traits and wood density (WD). We also measured stress wave velocity (SWV) of standing trees. Leaf area and circularity increased gradually with increase in latitude, whereas leaf index showed a tendency to increase with decrease in latitude. In linear regressions with a single independent variable, there was no significant relationship between leaf traits and environmental factors. Leaf traits might be influenced by multiple environmental factors. WD and SWV also increased gradually with decrease in latitude. In addition, WD was positively correlated with mean annual temperature (r = 0.829). We will discuss the geographic trends in the morphological variation revealed in this study.