Abstract: The present invention provides a new invention provides a new infusion bag that is easy to handle even if a long hanging string is used, allows easy infusion, and prevents the hanging string from being caught in a seal part during individual-package sealing. Said infusion bag 1 is provided with the following: a bag part 2 that contains the substance to be used to produce an infusion; and a hanging string 3, the tip of which is affixed to a tag 5 for holding the infusion bag and the base end 3a of which is affixed to the surface 4 of the bag part 2. This infusion bag is characterized by a structure wherein: the hanging string 3 is coiled into a spiral and disposed on the surface 4 of the bag part 2; and the tag 5 is detachably affixed to the surface 4 of the bag part 2 so as to cover the hanging string 3.