Power supply device

A power supply device comprising:

• a rotary member that holds a wire harness inserted therethrough;
• and
• a support member that swingably supports the rotary member and is fixed to a fixed structure body allowing a sliding structure body to slide thereto, or a sliding structure body sliding to a fixed structure body,
• wherein the rotary member has a cylindrical outer peripheral wall with a center axis in agreement with a central shaft portion of the rotary member, and a harness lead-out portion, the support member has one sidewall curved concentrically with the outer peripheral wall located along the outer peripheral wall, and the harness lead-out portion moves in a direction away from the sidewall when the sliding structure body is fully opened, the outer peripheral wall is exposed between the harness lead-out portion and the sidewall, the outer peripheral wall and the sidewall are overlapped with each other in a plate thickness direction in a state where the outer peripheral wall is exposed, and are adjacent to or come in contact with each other so that foreign matters are prevented from entering between the outer peripheral wall and the sidewall.