A thrust bearing system, comprising: a first bearing which is hollow, includes an annular wall connected to an axial end, and has a first inner face located on the axial end; a second bearing located in the first bearing, wherein the second bearing includes a second inner face axially facing the first inner face and an outer face located on an opposite side of the second inner face, and wherein a partitioning space is formed between the first inner face and the second inner face; a rotating member including a shaft and a radially protruding portion coupled to the shaft, wherein the radially protruding portion is located in the partitioning space, wherein a dynamic pressure gap is formed between the radially protruding portion and the first inner face during rotation, and wherein another dynamic pressure gap is formed between the radially protruding portion and the second inner face during rotation; and a leakproof ring coupled to the first bearing and covers the outer face of the second bearing, wherein the leakproof ring includes a shielding disc having a through hole, wherein the shaft extends through the through hole of the shielding disc and an axial hole of the second bearing, wherein the through hole has a diametric width larger than a hole diameter of the axial hole of the second bearing, and wherein the thrust bearing system is characterized in that the shaft includes an inner end face located in the first bearing, wherein a stub protrudes from the inner end face, wherein the radially protruding portion is coupled to the stub, wherein the stub has a height larger than a thickness of the radially protruding portion, and wherein an oil receiving space is formed between the radially protruding portion and the inner end face. a first bearing which is hollow, includes an annular wall connected to an axial end, and has a first inner face located on the axial end; a second bearing located in the first bearing, wherein the second bearing includes a second inner face axially facing the first inner face and an outer face located on an opposite side of the second inner face, and wherein a partitioning space is formed between the first inner face and the second inner face; a rotating member including a shaft and a radially protruding portion coupled to the shaft, wherein the radially protruding portion is located in the partitioning space, wherein a dynamic pressure gap is formed between the radially protruding portion and the first inner face during rotation, and wherein another dynamic pressure gap is formed between the radially protruding portion and the second inner face during rotation; and a leakproof ring coupled to the first bearing and covers the outer face of the second bearing, wherein the leakproof ring includes a shielding disc having a through hole, wherein the shaft extends through the through hole of the shielding disc and an axial hole of the second bearing, wherein the through hole has a diametric width larger than a hole diameter of the axial hole of the second bearing, and wherein the thrust bearing system is characterized in that the shaft includes an inner end face located in the first bearing, wherein a stub protrudes from the inner end face, wherein the radially protruding portion is coupled to the stub, wherein the stub has a height larger than a thickness of the radially protruding portion, and wherein an oil receiving space is formed between the radially protruding portion and the inner end face.