Abstract: New method and apparatus for automatically producing a number of bag-shaped packages with a cap body integrally attached thereto and specific content filled at a high operational efficiency are disclosed. They are produced one by one using continuous thin flat film of synthetic resin as raw material by way of the steps of punching a cap body insert hole, inserting the cap body portion of the cap body into the punched hole, heat sealing it to the film, forming a tubular product, effecting longitudinal heat sealing, effecting transverse heat sealing of the lower end part of the tubular product to form a bag-shaped product, filling the latter with specific content, effecting transverse heat sealing of the upper end part of the content filled bag-shaped product and cutting off the latter along the center line extending between the adjacent products. Longitudinal heat sealing is generally effected while the film is displaced downward.