Light alloy wheel

A light alloy wheel which has a mass M in kilogram, a nominal rim (2) width W in inch and a nominal rim diameter D in inch which satisfy the following condition: 0.35 ≤ M/(W+D-10) ≤ 0.55, comprises a rim having bead seats for tire beads, a hub to be connected to an axle (3) of an automobile, and a disk (5) part between the hub (4) and the rim. The disk part comprises a plurality of spoke parts extending radially from the hub to the rim, and a plurality of fin parts each extending between the adjacent spoke parts and being thinner than the spoke parts (15).