A wire member 1 includes: a core member 2 that has an elongated shape； and a surface-disposed member 3 that is spirally disposed on a surface of the core member 2 so as to leave predetermined spaces along a longitudinal direction of the core member 2. In a cross-sectional view taken along the axis of the core member 2, the front end and the rear end of each of projections 3A formed by the surface-disposed member 3 respectively form contact angles θ1, θ2 each being 5° or greater relative to the surface of the core member 2.
