Problem to be solved. To provide a method of easily producing seaweed powders without discarding a raw material. Solution. A method of producing seaweed powders of this invention includes: a grinding step 3 of grinding seaweed coarsely crushed and desalted by subjecting the seaweed to compression, shearing, and rotational friction to obtain a gelatinous seaweed solution; and a drying/pulverizing step 4 of drying and pulverizing the gelatinous seaweed solution ground in the grinding step.

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