To provide a drug delivery device capable of safely sealing and packaging a thin patch containing a small transdermal drug and further improved in openability and opening size by tearing by hand when taking out the packaged patch, Provided is a small transdermal drug bag from which a patch drug can be easily taken out. A bag for sealing and packaging a small patch containing a transdermal drug, the bag being formed by sealing a peripheral edge of a laminate comprising a synthetic resin film and a metal foil, the bag comprising a notch portion for opening the bag, One or more opening lines formed by irradiating and scanning a laser beam in a predetermined wavelength region on the front surface or the back surface of the bag, and one or more opening guide lines having a shape crossing at an oblique angle at the shortest position of the opening...

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