Sheet transport device including: first tray having receiving area receiving sheets ejected in first direction; second tray in second direction intersecting first direction with respect to first tray; transporter causing pushing member to move between first and second positions at respective sides of receiving area along second direction, second position closer to second tray than first position, transporter transporting first sheet set to second tray by putting pushing member in contact with end of first sheet set facing first position and causing pushing member to move from first to second position when first sheet set is ejected onto first tray; and direction changer causing guide member to guide, in subsequent second sheet set, at least sheet ejected while pushing member moves across receiving area and to change sheet traveling direction to upward direction over pushing member by putting guide member in predetermined angle with respect to horizontal direction.