NOVELTY - Platinum hollow nanoparticles comprises outer shell portion containing platinum component including nanoparticles having particle diameter of 100 nm or less, and hollow portion in which the inside of the outer shell portion is equipped. While connecting hollow portion to the exterior of the outer shell portion, the outer shell portion is equipped with opening having largest aperture diameter of 0.5 nm or more, computed by an image-analysis method.    USE - Platinum hollow nanoparticles are used for manufacture of platinum hollow nanoparticles supported catalyst component for manufacture of polymer electrolyte fuel cell (all claimed).    ADVANTAGE - The platinum hollow nanoparticles have excellent catalytic activity with small amount of platinum, and practicability, and enables efficient and economical manufacture of platinum hollow nanoparticles supported catalyst component with high productivity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) platinum hollow nanoparticles supported catalyst component, which comprises platinum hollow nanoparticles supported by support becomes from the electroconductive material;    (2) polymer electrolyte fuel cell, which comprises electrode with platinum hollow nanoparticles supported catalyst component;    (3) manufacture of platinum hollow nanoparticles supported catalyst component, which involves immersing support in the reaction liquid in which the compound containing base metal more base than platinum exists, making the surface of the support to generate the template particles containing base metal by reducing the compound containing base metal, supplying compound containing platinum in the reaction liquid, reducing the compound containing platinum, depositing platinum as outer shell portion on portion of surface of the template particles to form platinum hollow nanoparticles precursor, recovering the support in which the platinum hollow nanoparticles precursor is supported, from the reaction liquid, and removing the template particles from the platinum hollow nanoparticles precursor, to obtaining platinum hollow nanoparticles; and    (4) manufacture of polymer electrolyte fuel cell, which involves immersing support in the reaction liquid in which the compound containing base metal more base than platinum exists, making the surface of the support to generate the template particles containing base metal by reducing the compound containing base metal, supplying compound containing platinum in the reaction liquid, reducing the compound containing platinum, depositing platinum as outer shell portion on portion of surface of the template particles to form platinum hollow nanoparticles precursor, positioning platinum hollow nanoparticles precursor in fuel electrode and/or oxidizing agent electrode, and removing the template particles by driving the fuel cell and bleaching the platinum hollow nanoparticles precursor in acidic environment.