Sheet punching device, sheet processing device provided with the same, and image forming device

A sheet punching device that applies punching processing to a conveyed sheet, comprising:

• a placement table on which the sheet is placed;
• a hollow punching member that punches the sheet placed on the placement table;
• a punching moving member that moves the punching member between a punching position where the sheet is punched and a retreat position retreated from the punching position;
• a punching drive section that drives the punching moving member;
• a waste pushing member that is disposed in the hollow portion of the punching member and pushes punching waste remaining in the hollow portion;
• a pushing moving member that moves the waste pushing member between a pushing position protruding from the hollow portion of the punching member and a housing position in the hollow portion;
• a pushing drive section that drives the pushing moving member;
• and
• a punching controller that controls the punching drive section and the pushing drive section,
• wherein the punching controller controls, according to attribute information of a sheet placed on the placement table, whether a waste pushing operation of the waste pushing member is performed for each punching operation or intermittently.