Abstract: A stapler comprised of a base body having an anvil at one end, a staple holder having a slot at one end in the vicinity of an end wall and a staple block consisting of many staples positioned between said wall and a pushing spring, a pushing body having a staple pushing plate at one end for extruding staples one by one through said slot, the other ends of said base body and staple holder being connected by a connecting shaft so that said holder may be positioned between said bodies, the end of the staple holder being detachably connected to the shaft. The base body may also be connected to the pushing body through a resilient connecting part material so as to form a splay mouth, with the return spring being formed integrally on the base body and/or pushing body and a projection provided to contact the top of said integral spring. A guide member may be provided on an upper bottom face of the holder, with the outer face of the guide member constructed to guide a staple block.