A sealant for a semiconductor light-emitting device, wherein the sealant has a total content of Si, Al, Zr, Ti, Y, Nb and B of 20 weight % or more, the sealant being obtainable by either: (i) a process of drying a polycondensate obtained by performing hydrolysis and polycondensation of a compound represented by the following formula and/or an oligomer thereof: [Chemical Formula 1] SiX n Y 1 4-n wherein X represents a hydrolyzable group, Y 1 represents a monovalent organic group, and n represents an integer of 1 or larger representing the number of X groups, where 4≥n; or (ii) a process of drying a polycondensate obtained by performing hydrolysis and polycondensation of a compound represented by the following formula and/or an oligomer thereof: [Chemical Formula 2] (SiX t Y 1 3-t) u Y 2 wherein X represents a hydrolyzable group, Y 1 represents a monovalent organic group, Y 2 represents a u-valent organic group, t represents an integer of 1 or larger and 3 or smaller, and u represents an integer of 2 or larger; and wherein the sealant has the following features, and: in the solid Si-nuclear magnetic resonance spectrum as measured in accordance with the present description, the sealant comprises at least one peak selected from a group consisting of (i) a peak whose peak top position is in an area of a chemical shift of -40 ppm or more and 0 ppm or less, and whose half width is 0.3 ppm or more and 3 ppm or less, and (ii) a peak whose peak top position is in an area of a chemical shift of -80 ppm or more and less than -40 ppm, and whose half width is 0.3 ppm or more and 5 ppm or less, the refractive index with respect to light having 550 nm wavelength is 1.45 or larger, and the total content of Pt and Rh is 0.1 ppm or less. (i) a process of drying a polycondensate obtained by performing hydrolysis and polycondensation of a compound represented by the following formula and/or an oligomer thereof: [Chemical Formula 1] SiX n Y 1 4-n wherein X represents a hydrolyzable group, Y 1 represents a monovalent organic group, and n represents an integer of 1 or larger representing the number of X groups, where 4≥n; or X represents a hydrolyzable group, Y 1 represents a monovalent organic group, and n represents an integer of 1 or larger representing the number of X groups, where 4≥n; or (ii) a process of drying a polycondensate obtained by performing hydrolysis and polycondensation of a compound represented by the following formula and/or an oligomer thereof: [Chemical Formula 2] (SiX t Y 1 3-t) u Y 2 wherein X represents a hydrolyzable group, Y 1 represents a monovalent organic group, Y 2 represents a u-valent organic group, t represents an integer of 1 or larger and 3 or smaller, and u represents an integer of 2 or larger; and X represents a hydrolyzable group, Y 1 represents a monovalent organic group, Y 2 represents a u-valent organic group, t represents an integer of 1 or larger and 3 or smaller, and u represents an integer of 2 or larger; and in the solid Si-nuclear magnetic resonance spectrum as measured in accordance with the present description, the sealant comprises at least one peak selected from a group consisting of (i) a peak whose peak top position is in an area of a chemical shift of -40 ppm or more and 0 ppm or less, and whose half width is 0.3 ppm or more and 3 ppm or less, and (ii) a peak whose peak top position is in an area of a chemical shift of -80 ppm or more and less than -40 ppm, and whose half width is 0.3 ppm or more and 5 ppm or less, (i) a peak whose peak top position is in an area of a chemical shift of -40 ppm or more and 0 ppm or less, and whose half width is 0.3 ppm or more and 3 ppm or less, and (ii) a peak whose peak top position is in an area of a chemical shift of -80 ppm or more and less than -40 ppm, and whose half width is 0.3 ppm or more and 5 ppm or less, the refractive index with respect to light having 550 nm wavelength is 1.45 or larger, and the total content of Pt and Rh is 0.1 ppm or less.