A method for producing a powder-containing sheet containing a powder in separated container rooms formed between two sheet materials (4, 8), the method comprising: forming the container rooms in a first sheet material; thereafter, transporting the sheet material on a circumferential surface of an anvil roller; during the transporting process, allowing the granular powder fed from a granular powder feeding hopper through a feeding passage to be received in the container rooms; thereafter, covering the container rooms with a second sheet material; and joining the two sheet materials (4, 8) to each other on the peripheries of the container rooms, wherein a shaping roller having a plurality of protruding portions on its circumferential surface is disposed so as to face the anvil roller so that a plurality of recessed portions provided on the circumferential surface of the anvil roller mesh with the protruding portions; the first sheet material is fed onto the circumferential surface of the shaping roller; and the container rooms are formed in the first sheet material by the protruding portions and the recessed portions that mesh with each other, and the pressure inside the recessed portions of the anvil roller is reduced so that the first sheet material is transported with the container rooms sucked and held in the recessed portions of the anvil roller, to a position at which the first sheet material and the second sheet material are joined to each other, and part of the granular powder flowing in the feeding passage is excluded to the outside of the feeding passage so that the granular powder is intermittently fed from the granular powder feeding hopper into the container rooms, and by returning the granular powder spilling from the feeding passage and caught inside a casing, which encloses part of the feeding passage, wherein the casing is provided with an air intake port and a discharge duct connected to a vacuum source is attached to the casing, wherein the granular powder is sucked by the discharge duct, back to the granular powder feeding hopper, the granular powder can be reused. forming the container rooms in a first sheet material; thereafter, transporting the sheet material on a circumferential surface of an anvil roller; during the transporting process, allowing the granular powder fed from a granular powder feeding hopper through a feeding passage to be received in the container rooms; thereafter, covering the container rooms with a second sheet material; and joining the two sheet materials (4, 8) to each other on the peripheries of the container rooms, wherein a shaping roller having a plurality of protruding portions on its circumferential surface is disposed so as to face the anvil roller so that a plurality of recessed portions provided on the circumferential surface of the anvil roller mesh with the protruding portions; the first sheet material is fed onto the circumferential surface of the shaping roller; and the container rooms are formed in the first sheet material by the protruding portions and the recessed portions that mesh with each other, and the pressure inside the recessed portions of the anvil roller is reduced so that the first sheet material is transported with the container rooms sucked and held in the recessed portions of the anvil roller, to a position at which the first sheet material and the second sheet material are joined to each other, and part of the granular powder flowing in the feeding passage is excluded to the outside of the feeding passage so that the granular powder is intermittently fed from the granular powder feeding hopper into the container rooms, and by returning the granular powder spilling from the feeding passage and caught inside a casing, which encloses part of the feeding passage, wherein the casing is provided with an air intake port and a discharge duct connected to a vacuum source is attached to the casing, wherein the granular powder is sucked by the discharge duct, back to the granular powder feeding hopper, the granular powder can be reused.