Abstract: Portable office stapler, having a flat box-like configuration with an approximately constant cross-section in the shape of a flattened cake of soap, having mechanical and covering functions, and comprising two parts, including a body containing all of the other moving members and a lid-button pivoted at the front and comprising most of the back for the box-like member, the latter transmitting between said lid-button and an anvil integral with the body all of the forces and reactions required for staple closing. At the front slit is provided for introducing sheets or layers to be stapled with the cooperation thereat of said anvil, a staple-carrying magazine, a feeder, a push-load plate, a hammer, and a staple closing plate. The drive for all of these members is produced by a button acting through a roller on the hammer at a contact location between one pin and the button-pressing zone and between a second pin and the hammer head.