Abstract: In an apparatus (1) for stapling sheets (10) deposited in stacks, stapling devices (6 and 7) are attached to a pivotable support (3) which is movable from a locked operating position (position I) into an easily accessible service position (position II). The stapling devices (6 and 7) are attached in easily detachable fashion to holders (4 and 5) which are guided displaceably on the shaft (8) and can be set to different stapling positions by a follower mechanism. Attached releasably to each of the holders (4 and 5) is a mounting plate (44 and 45) on which the stapling devices (6 and 7), and all the components necessary for operation thereof, are releasably attached. The support (3) is movable into a position (position II) in which access is possible to the stapling devices (6 and 7) and the mounting plates (44 and 45) via a sheet stack depositing area (13) of the apparatus (1) which is accessible from outside the apparatus.