The mechanical design of the CMS Phase-2 Tracker addresses the stringent requirements imposed by the High Luminosity LHC environment, including stability under high radiation and thermal loads, a minimal material budget, and precise alignment across large detector volumes. This article describes the engineering challenges and the mechanical solutions implemented in both the Inner Tracker and the Outer Tracker. Key topics include the design of support structures, thermal management systems, carbon-fibre composite components, and the modularity that enables efficient assembly and maintenance. The integration strategy, from substructures to the fully assembled Tracker, is presented together with results from mechanical qualification tests, thermal cycling, and alignment validation, demonstrating the readiness of the Phase-2 Tracker for High Luminosity LHC operation.