There is provided a universal joint which is a universal joint of a block type in which a bearing cup for supporting a trunnion of a joint cross is integrally formed with a key portion, and the bearing cup is joined to be fixed to a yoke by a bolt in a state of fitting the key portion to a key way of the yoke, in which by forming WC—Ni—Cr thermally-sprayed coatings at both side surfaces of the key portion, corrosion resistance of the key portion is promoted, even when used over a long period of time in a drive system of a rolling mill or the like, a clearance between the key portion and the key way caused by corrosion of the key portion is prevented from being brought about, and a stable performance can be maintained over a long period of time by promoting service life of the bearing and preventing an excessively large bending load from being operated to the bolt.