The present invention relates to an aerogel blanket including an aerogel structure and a substrate for a blanket, wherein the aerogel structure includes a three-dimensional network structure formed by a plurality of aerogel particles aggregated or bonded, and an average aerogel structure size (D50) measured by spraying 10 ml of dry powder of the aerogel structure with air at a pressure of 15 psi, and using laser diffraction of 780 nm wavelength is 5 μm to 10 μm.