noun
top surface; upper side
Refers to the top face or upper side of an object, often contrasted with 下面 (the underside).
See also: 下面
箱の上面にラベルを貼ってください。
Please attach the label to the top surface of the box.
このテーブルの上面は傷がつきやすい。
The top surface of this table scratches easily.