A thrust bearing and a bearing device are provided, which reduce sliding friction loss and improve foreign matter discharge. A slide surface of a thrust bearing includes a planar portion, a taper portion, and a pocket portion which are sequentially formed along a predetermined sliding direction. The taper portion is constituted by a taper surface whose thickness gradually decreases from the end portion of the planar portion toward the sliding direction. The pocket portion includes a bottom surface having a wall thickness that is thinner than the thinnest portion of the taper portion, a first side surface, and a second side surface. The first side surface is formed on the side of the taper portion. The second side surface is formed on a side opposed to the first side surface. The taper portion is configured such that the depth from the thinnest portion is between 10 [mu]m and 80 [mu]m. The pocket portion is configured such that a first angle between the virtual surface extending the bottom surface and the second side surface is between 90 degrees and 120 degrees, and a second angle between the virtual surface and the tapered surface extending the first side surface is between 60 degrees and 120 degrees.