Abstract: The expansion rivet consists of an expansion peg and a drive-in pin, which in the preassembled state of the expansion rivet are captively joined together. In its midsection, the expansion peg has an insertion hole adapted to the form of the drive-in pin, two lateral engagement wings projecting in opposite directions and two opposing spreader legs projecting downward at right angles. The preassembled drive-in pin protrudes slightly out of the expansion peg but is in engagement with the two spreader legs. When the drive-in pin is driven into the expansion peg, the spreader legs are forced apart by the drive-in pin to form a riveted connection.