In near-infrared systems for optical sensing and imaging technologies, an improved signal-to-noise ratio and more advanced object detection and analysis using polarizers are required. Such polarizers are limited, and broadband wire-grid polarizers are potential candidates. However, their high reflectivity and high cost limit their application. Herein, we fabricated a low-reflectivity wire-grid polarizer sheet that can be used in visible and near-infrared regions by a simple process using only nanoimprinting and nickel electroless plating; further, metal removal steps such as chemical mechanical polishing were not required. The results obtained by optimizing the structural shape of the mold and precisely controlling the thickness of the electroless plating confirmed that the polarizer could be used for visible and near-infrared light. Because the sheets can be manufactured using general-purpose equipment upon mold preparation, they can be employed in wide-ranging applications with small capital investment.