A multilayer capacitor built-in substrate includes a core substrate, a multilayer capacitor mounted on one principal surface of the core substrate, and a burying layer provided on the one principal surface of the core substrate to bury the multilayer capacitor. The multilayer capacitor includes a laminated body in which dielectric layers and internal electrode layers are laminated, and first and second external electrodes. The laminated body includes an effective region in which internal electrode layers respectively connected to the first external electrode and the second external electrode are laminated with a dielectric layer located therebetween, and a non-effective region surrounding the effective region. The core substrate includes, on the one principal surface, a first land electrode electrically connected to the first external electrode and a second land electrode electrically connected to the second external electrode.