Passenger transferring device

A passenger conveying device, comprising:

• an entrance, an exit, and a plurality of steps disposed between the entrance and the exit, wherein a skirt guard panel is respectively disposed on two sides of the step, and the step is constructed to reciprocally move between the entrance and the exit along a path defined by the skirt guard panel;
• the step comprises a tread, a tread guard panel is attached to each of two sides of the tread, and the tread guard panel is located between the tread and the skirt guard panel;
• and
• the tread guard panel comprises two or more protrusions, each protrusion is constructed to protrude with respect to an upper surface of the tread, and a protrusion farther away from the tread has a larger protrusion height,
• wherein the step further comprises a riser, a riser guard panel is attached to each of the two sides of the riser, and the riser guard panel is located between the riser and the skirt guard panel;
• wherein the riser guard panel comprises a first edge, a third edge, and a second edge disposed between the first edge and the third edge, a distance from the first edge to the skirt guard panel is greater than that from the third edge to the skirt guard panel, and the second edge is constructed to have a curved contour with smooth transition.