Staple storage cassette and cassette type stapler

A staple storage cassette comprising:

• a cassette rail member having a pair of guide rails disposed in parallel with a gap therebetween;
• a staple assembly including a plurality of staples connected in succession, slidably installed on the cassette rail member;
• a feeder which makes contact with a rear end portion of the staple assembly and slidably movable on the cassette rail member;
• and a cassette cover member which covers at least both side surfaces and a top surface in the longitudinal direction and of the cassette rail member so as to form a passage into which the staple and the feeder are inserted,
• wherein the cassette cover member has a stopper for positioning a head position of the staple assembly at a front end portion thereof and a blade guide hole through which a staple pushing blade passes, the blade guide hole being located adjacent to the stopper, the feeder includes an elastically engaged claw piece, an engaging concave portion which engages the elastically engaged claw piece only in one direction is formed continuously in the longitudinal direction in the inner surface of the cassette cover member so as to allow the feeder to move only in a forward direction.