Provided is a tablet packing method including: a step of conveying a long sheet material that is a material of a packing bag in a longitudinal direction; a step of introducing all of a same kind of tablets of the tablets prescribed to each patient to a packing space formed by the conveyed long sheet material; a step of sealing the long sheet material to form a section in which the packing space provided with the tablets is airtight; and a step of cutting the long sheet material provided with one or a plurality of the sections, in predetermined units in the longitudinal direction.