NOVELTY - A quartz glass component (10) has quartz glass base material (12) and quartz glass surface layer film (14) obtained by applying polysilazane-containing solution containing fluorescent substance particles (16) and spherical silica particles (18) on surface of the base material, drying in air and heating in steam atmosphere. The mass ratio of fluorescent substance particles with respect to total amount of fluorescent substance particles and polysilazane is 10:3-7. The amino group concentration in the quartz glass surface layer film is 1000 ppm or less.    USE - Quartz glass component is used for glass sealing portion of light-emitting diode element in solar cell.    ADVANTAGE - The quartz glass component interrupts ultraviolet-ray, has excellent environmental tolerance, heat resistance, durability, and color rendering property, converts wavelength conversion by efficient method, and is manufactured at low temperature. The adhesion of organic substance in component surface is prevented.    DETAILED DESCRIPTION - A quartz glass component has a quartz glass base material and a quartz glass surface layer film formed on surface. The quartz glass surface layer film is obtained by applying polysilazane-containing solution containing fluorescent substance particles having average particle diameter of 0.1-20 mu m, and spherical silica particles having hydrophobicity and average particle diameter of 1-100 nm on surface of the quartz glass base material, drying in air and heating in steam atmosphere. The mass ratio of fluorescent substance particles with respect to total amount of fluorescent substance particles and polysilazane in polysilazane-containing solution is 10:3-7. The amino group concentration in the quartz glass surface layer film is 1000 ppm or less. An INDEPENDENT CLAIM is included for manufacture of quartz glass component.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the quartz glass component.    Quartz glass component (10)    Quartz glass base material (12)    Quartz glass surface layer film (14)    Fluorescent substance particles (16)    Silica particles (18)