Provided is a thrust sliding bearing which, while allowing a shaft member to smoothly rotate, can support for a long period of time a thrust load acting on the shaft member. A thrust sliding bearing comprises: an upper case (2) mounted to an upper support for mounting a strut-type suspension to a vehicle body; a lower case (3) mounted to an upper spring seat for supporting the upper end of the coil spring of the strut-type suspension, the lower case (3) being combined with the upper case (2) to form an annular space (5); and an annular center plate (4) disposed in the annular space (5) and enables the relative rotation between the upper case (2) and the lower case (3). The annular space (5) is filled with lubricating grease. The center plate (4) comprises: a bearing surface (42) in slidable contact with the surface (27) to be supported of the upper case (2); and annular protrusions (47, 48) provided at the inner peripheral edge and the outer peripheral edge of the bearing surface (42) so as to extend in the circumferential direction of the center plate (4).