Abstract: A pipe temperature adjusting system includes: a liquid conducting pipe; a heat-insulating cover covering the liquid conducting pipe in such a manner as to define a cylindrical space between the heat-insulating cover and the liquid conducting pipe; a heat exchange flow path disposed in the cylindrical space and along the liquid conducting pipe and allowing a heat exchange medium to flow through the heat exchange flow path; and a pump configured to supply the heat exchange medium into the heat exchange flow path. Covering the liquid conducting pipe with the cylindrical space and causing the heat exchange medium to flow through the heat exchange flow path in the cylindrical space adjusts the internal temperature of the cylindrical space to thereby adjust the temperature of the liquid conducting pipe.