Sheet post-processing apparatus, and image forming system and electronic apparatus provided therewith

A sheet post-processing apparatus that receives a sheet discharged from an upstream apparatus and that performs predetermined post-processing on the sheet, the sheet post-processing apparatus comprising:

• an apparatus body;
• a body frame that constitutes a frame of the apparatus body;
• a sheet conveyance passage through which the sheet is conveyed from a carry-in port provided in a first side surface of the apparatus body to a carry-out port provided in a second side surface of the apparatus body opposite from the first side surface;
• an elevating tray configured to ascend and descend along the second side surface and stack the sheet discharged from the carry-out port stacked;
• and
• an elevating unit that makes the elevating tray ascend and descend,
• wherein
• the elevating unit includes a pair of rails that are provided on the body frame and that guide ascent and descent of the elevating tray,
• the body frame includes:
• a plurality of vertical frame members that extends in a vertical direction and
• a plurality of horizontal frame members that extends in a horizontal direction and is joined by welding to the plurality of vertical frame members,
• the pair of rails are formed integrally with among the plurality of vertical frame members, a pair of vertical frame members provided corresponding to the second side surface,
• the horizontal frame members and the vertical frame members are rectangular pipes made of metal and having a rectangular cross-sectional shape on a plane orthogonal to a longitudinal direction and
• the horizontal frame members and the vertical frame members are joined together by welding.