To prevent a metal strap from being sufficiently deformed by a surface pressure.

This portable manually actuated strapping unit which is a device for sealing provided with a base plate provided with a supporting surface for being arranged on a packaged article and a rotatable die plate carrier and in which the die plate carrier can be rotated around the first supporting point arranged in the front end region of the base plate from a release end point position to a seal end point position and in the reverse way in relation to the base plate, is characterized in that at least at the seal end point position, a region where the transmitting element is brought into contact with the die plate carrier approximately coincides with the cutting means or is the back of the cutting means in relation to the direction extending at least substantially in parallel to orientation of a strap between the device for sealing and a wheel for being set in tension is provided.