A button comprises a button body (10, 10a, 10b) and a prong (20, 20a, 20b) adapted to be arranged on the side of cloth (30) opposite to the side thereof on which the button body mentioned above is set in place to nip the cloth therebetween and to fixedly secure the button body to the cloth. The button body mentioned above contains an outer shell member (13), which comprises a button back (15, 15a, 15b) and a cap (14, 14a, 14b), and an insert (11, 11a, 11b) accommodated in the outer shell member. In order to make a whitish button which could be heretofore obtained only by plating, at least the button back mentioned above is made of aluminum or an aluminum alloy. Preferably, the button back mentioned above is made of an aluminum alloy containing 3-6% by weight of magnesium, and the cross-sectional thickness of the above-mentioned button back is in the range of 0.25-0.6 mm. Further, it is desirable that the above-mentioned cap and the insert should also be made of an aluminum alloy.