The present invention aims to provide a manufacturing method of instant rice which may be restored to edible rice simply by adding hot water. The method includes a first pressurized-steaming step for steaming raw material rice under pressure while the raw material rice is being agitated, and forming a gelatinized layer on a surface of the raw material rice, a hydration step for hydrating the raw material rice having the gelatinized layer formed on the surface, a tempering step for making moisture content of the hydrated raw material rice uniform, a second pressurized-steaming step for steaming the hydrated raw material rice under pressure while the raw material rice is being agitated, and gelatinizing the raw material rice to a center, a dehydration step for dehydrating the raw material rice that is gelatinized to the center, and an expansion step for expanding the dehydrated raw material rice.