The present invention provides a tire puncture sealant which exhibits excellent storage stability while having reduced low-temperature viscosity and therefore improved low-temperature injection properties, and also exhibits excellent initial sealing properties and sealing force retention properties. The present invention relates to a tire puncture sealant containing rubber latex and 1,3-propanediol, the 1,3-propanediol being present in a proportion of 55 to 61% by mass of the liquid component.