Provided is a method for producing an airtight package that can reduce thermal stress occurring in the inside of a glass lid due to irradiation with laser light to prevent occurrence of cracks and the like in the glass lid. A method for producing an airtight package in which a container 1 containing a device 5 mounted therein is sealed with a glass lid 3 includes the steps of: mounting the device 5 to an interior of the container 1; disposing a sealing material 6 between a frame 2 of the container 1 and the glass lid 3 and placing the glass lid 3 on top of the frame 2 of the container 1; and irradiating the sealing material 6 through the glass lid 3 with laser light while scanning the laser light along the frame 2 to melt the sealing material 6 by heat and form a sealing material layer, thus sealing the glass lid 3 and the frame 2 together with the sealing material layer, wherein irradiation with the laser light is started from an irradiation start point B, then performed by scanning the laser light a plural number of times all around along the frame 2, and then terminated at an irradiation end point C located ahead of the irradiation start point B in a direction of the scanning A.