Abstract: A device for forming webs used for packaging containers with and without a pull-tab including, along the conveyance path of a web conveyed at a constant interval, a punch hole opening section for opening liquid-outlets, a strip tape pasting section which closes punch holes opened on a web with a wide strip tape or pastes narrow strip tape on a web having no punch holes, and a pull-tab pasting section having a pull-tab tape cutting and heating depositing member which cuts and heat-deposits a pull-tab on the web provided on the punch holes. Either a wide strip tape or a narrow strip tape is selectively supplied to the strip tape pasting section, and a pull-tab tape is supplied to the pull-tab pasting section. The punch hole opening section and the pull-tab pasting section can be inactivated. Thus, containers with and without a pull-tab can be manufactured by a single web forming device.