A process for continuously producing a water-absorbing resin comprising a plurality of joined continuous steps: a polymerization step of polymerizing an aqueous unsaturated monomer solution, a drying step of drying a particulated water-containing gel-like crosslinked polymer obtained in a finely crushing step during the polymerization or after the polymerization, a pulverizing step after the drying, a classification step after the drying, and a surface treatment step for the water-absorbing resin powder after the classification step, with some of the above steps kept running, the other steps are interrupted, and after taking countermeasures to the interruption, all steps as a whole are restarted, characterized in that (i) an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the drying step and either the pulverizing step or the classification step after the drying to temporarily store the water-absorbing resin after the drying at the time of interrupting the pulverizing step or the steps after the classification step, or/and an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the classification step and the surface treatment step to temporarily store the water-absorbing resin after the classification at the time of interrupting the steps after the surface treatment step, and (ii) the interruption of the steps is an interruption at the time of periodic maintenance or a temporal trouble. a polymerization step of polymerizing an aqueous unsaturated monomer solution, a drying step of drying a particulated water-containing gel-like crosslinked polymer obtained in a finely crushing step during the polymerization or after the polymerization, a pulverizing step after the drying, a classification step after the drying, and a surface treatment step for the water-absorbing resin powder after the classification step, with some of the above steps kept running, the other steps are interrupted, and after taking countermeasures to the interruption, all steps as a whole are restarted, characterized in that (i) an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the drying step and either the pulverizing step or the classification step after the drying to temporarily store the water-absorbing resin after the drying at the time of interrupting the pulverizing step or the steps after the classification step, or/and an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the classification step and the surface treatment step to temporarily store the water-absorbing resin after the classification at the time of interrupting the steps after the surface treatment step, and (ii) the interruption of the steps is an interruption at the time of periodic maintenance or a temporal trouble. (i) an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the drying step and either the pulverizing step or the classification step after the drying to temporarily store the water-absorbing resin after the drying at the time of interrupting the pulverizing step or the steps after the classification step, or/and an un-filled hopper or a hopper with a low filling ratio for temporarily storing the water-absorbing resin is installed between the classification step and the surface treatment step to temporarily store the water-absorbing resin after the classification at the time of interrupting the steps after the surface treatment step, and (ii) the interruption of the steps is an interruption at the time of periodic maintenance or a temporal trouble.