A construction machine, comprising: a main frame; a toolbox structure including a box body provided on the main frame of the construction machine and a lid, the box body having a storage space therein and being provided with an opening formed in an upper section of the box body, the lid being capable of opening and closing the opening in the box body, wherein the toolbox structure further includes: an illumination device disposed in the box body and configured to emit light toward the outside of the box body; and a protective cover disposed so as to cover the periphery of the illumination device and protect the illumination device, characterized in that the box body includes a bottom plate in which a bottom opening and a water drain hole are formed, the bottom opening extending through the bottom plate in a thickness direction thereof, the water drain hole being formed at a position further toward the outside of the bottom opening than a peripheral edge of the bottom opening, wherein the box body is placed on the main frame with a sealing member interposed therebetween, the sealing member being disposed along the peripheral edge of the bottom opening at a position further toward the inside of the bottom opening than the water drain hole, wherein the lid is provided with a weep hole through which water that collects on a top surface of the lid flows into the box body, and wherein the protective cover is configured to guide the water that flows into the box body through the weep hole to the water drain hole. a main frame; a toolbox structure including a box body provided on the main frame of the construction machine and a lid, the box body having a storage space therein and being provided with an opening formed in an upper section of the box body, the lid being capable of opening and closing the opening in the box body, wherein the toolbox structure further includes: an illumination device disposed in the box body and configured to emit light toward the outside of the box body; and a protective cover disposed so as to cover the periphery of the illumination device and protect the illumination device, characterized in that the box body includes a bottom plate in which a bottom opening and a water drain hole are formed, the bottom opening extending through the bottom plate in a thickness direction thereof, the water drain hole being formed at a position further toward the outside of the bottom opening than a peripheral edge of the bottom opening, wherein the box body is placed on the main frame with a sealing member interposed therebetween, the sealing member being disposed along the peripheral edge of the bottom opening at a position further toward the inside of the bottom opening than the water drain hole, wherein the lid is provided with a weep hole through which water that collects on a top surface of the lid flows into the box body, and wherein the protective cover is configured to guide the water that flows into the box body through the weep hole to the water drain hole. an illumination device disposed in the box body and configured to emit light toward the outside of the box body; and a protective cover disposed so as to cover the periphery of the illumination device and protect the illumination device, characterized in that the box body includes a bottom plate in which a bottom opening and a water drain hole are formed, the bottom opening extending through the bottom plate in a thickness direction thereof, the water drain hole being formed at a position further toward the outside of the bottom opening than a peripheral edge of the bottom opening, wherein the box body is placed on the main frame with a sealing member interposed therebetween, the sealing member being disposed along the peripheral edge of the bottom opening at a position further toward the inside of the bottom opening than the water drain hole, wherein the lid is provided with a weep hole through which water that collects on a top surface of the lid flows into the box body, and wherein the protective cover is configured to guide the water that flows into the box body through the weep hole to the water drain hole.