A binding tape member and a wire harness having a binding tape member configured to having the same function of conventional wire harnesses without the need for corrugated tube, pre-wrapping or post wrapping. The binding tape member has a tape member body that covers a group of electrical lines by being wrapped around the group of electrical lines. The tape body has a trapezoidal upper surface portion with an upper side and a lower side that correspond to the tape width end edges and a trapezoidal lower surface portion facing a direction opposite to the trapezoidal upper surface portion are alternatingly arranged in the tape length direction. Also, in a trapezoidal upper surface portion and a trapezoidal lower surface portion that are adjacent to each other, sides thereof in the tape length direction are connected to each other in an integrated manner by a rectangular side wall portion.