A staple removal device comprising: a placement portion on which a paper bundle (P) bound by a staple (S) including a crown portion (Sa) and a pair of leg portions is placeable, the paper bundle (P) including a first paper surface (Pa) on which the crown portion is exposed; a moving portion which is arranged at a position facing the first paper surface in a state where the paper bundle is placed on the placement portion , and is movable in a direction along the first paper surface, the moving portion including a tip end portion which is inclined in a wedge shape toward a tip end thereof; a driving portion configured to move the moving portion toward the crown portion (Sa) in the state where the paper bundle (P) is placed on the placement portion and to insert the tip end portion between the crown portion and the first paper surface; and an abutment portion which is arranged at a position facing the first paper surface in the state where the paper bundle is placed on the placement portion , the abutment portion being abutted against the crown portion from a direction opposite to an insertion direction of the tip end portion at least after the tip end portion is inserted between the crown portion and the first paper surface, characterized in that the abutment portion is movable in a direction away from the first paper surface, and moves in the direction away from the first paper surface following movement of the crown portion (Sa) when the crown portion is moved in the direction away from the first paper surface by an inclined surface of the tip end portion as the tip end portion is inserted between the crown portion and the first paper surface and moved in the insertion direction. a placement portion on which a paper bundle (P) bound by a staple (S) including a crown portion (Sa) and a pair of leg portions is placeable, the paper bundle (P) including a first paper surface (Pa) on which the crown portion is exposed; a moving portion which is arranged at a position facing the first paper surface in a state where the paper bundle is placed on the placement portion , and is movable in a direction along the first paper surface, the moving portion including a tip end portion which is inclined in a wedge shape toward a tip end thereof; a driving portion configured to move the moving portion toward the crown portion (Sa) in the state where the paper bundle (P) is placed on the placement portion and to insert the tip end portion between the crown portion and the first paper surface; and an abutment portion which is arranged at a position facing the first paper surface in the state where the paper bundle is placed on the placement portion , the abutment portion being abutted against the crown portion from a direction opposite to an insertion direction of the tip end portion at least after the tip end portion is inserted between the crown portion and the first paper surface, characterized in that the abutment portion is movable in a direction away from the first paper surface, and moves in the direction away from the first paper surface following movement of the crown portion (Sa) when the crown portion is moved in the direction away from the first paper surface by an inclined surface of the tip end portion as the tip end portion is inserted between the crown portion and the first paper surface and moved in the insertion direction. <EOS>