A wiring member includes a sheet material in which a weight reduction space is formed and a wire-like transmission member fixed on the sheet material. For example, the weight reduction space includes a bottomed hole. For example, the sheet material includes a first base material in which a base material side through hole passing through the first base material in a thickness direction is formed and a second base material overlapped with the first base material to cover the base material side through hole, and the base material side through hole which is partially covered by the second base material forms the bottomed hole.