The end piece of sunshade's edge rail comprises an end plate, which includes a first edge surface, a second edge surface and a first end surface. The end plate further includes a second end surface, which is to be placed against an end of the edge rail and which has at least one gripping protrusion adaptable to fit inside the edge rail. The end plate is further provided with a first hole for the penetration of a guiding string. The end piece is further provided with a string channel, which includes a first end opening onto the first edge surface and a second end opening onto the second edge surface. The first hole opens into the string channel. A guiding string included in the sunshade can be extended into the first hole by way of the string channel.