A mold temperature control unit with which piping connection for supply and drain of cooling water in unit setup can be extremely simply made. In a mold temperature control unit 1 which unit body 2 comprises a plurality of cooling water systems performing supply and drain of cooling water to/from a plurality of elements to be cooled in a mold, a single cooling water supply port 11 and a single cooling water drain port 12 for said plurality of cooling water systems are disposed on the outer panel of the unit body 2.