An illuminated belt buckle for a seat belt device of a motor vehicle including a housing (1), a push button (2) displaceable in the housing (1), an insertion slot (12) delimited by an edge section (23) of the housing (1) and the push button (2) for insertion of a belt tongue that can be locked in the belt buckle, and at least one light-emitting surface (13,14). The light-emitting surface (13,14) having a linear contour, the shape of which matches the shaping of a laterally positioned edge side (24) of the push button (2) when viewed toward the insertion slot (12).