A hot press device manufacturing a multilayered printed board by pressing processed members laminated by mutually opposing heating plates includes: a plurality of heating plates including a plurality of projected parts and punched parts engaging therewith and capable of moving in a direction in which the processed members are laminated; and a pressure mechanism pressurizing each of the heating plates in the lamination direction, wherein the processed member is arranged between the heating plates and is pressed by the heating plates pressurized by the pressure mechanism while engaged with each other.