This is the report that authors examined on the wood of “Sawara” Chamaecyparis pisifera of Tochigi prefecture, as the 1 st report. 1. The resin cells are dotted on the cross section of wood, almost parallel with annual ring and rather densely on the scope of some width. 2. The number of resin cells per 1cm² of late wood on the cross section about ten times the number of resin cells per 1cm² of early wood. In the extremely narrow annual ring, resin cell are few or are often absent. 3. The diameter of resin cells, both radial and tangential, decreases from inner part to outer part of the annual ring. 4. The thickness of resin-cell wall of late wood it generally thicker than that of early wood. 5. The lengths of resin cells are almost alike whether they exist in late wood of in early wood. 6. On the diameter of cells and on the thickness of cell walls, resin cells are smaller than tracheids neighbouring with resin cells and the difference is especially large in radial direction.