A turbo machine (100a, 100b) comprising: a rotating shaft; an impeller; a first bearing that supports the rotating shaft; and a first supply passage for supplying a lubricating liquid between the rotating shaft and the first bearing, wherein the impeller is fixed to the rotating shaft, a working fluid intake side of the impeller facing the first bearing, the rotating shaft includes a first taper portion and a first cylindrical portion, the first taper portion increasing in diameter toward the impeller in an axial direction of the rotating shaft, the first cylindrical portion being located adjacent to a large diameter end of the first taper portion, the first bearing includes a first taper support surface and a first cylindrical portion support surface, the first taper support surface including a first taper hole forming surface that forms a taper hole that extends toward a small diameter end of the first taper portion from a particular point on the first bearing in an axial direction of the first bearing, the first taper support surface rotatably supporting the first taper portion via the lubricating liquid, the first cylindrical portion support surface rotatably supporting the first cylindrical portion via the lubricating liquid, the first supply passage is open to a space formed between the first cylindrical portion and the first cylindrical portion support surface, and an inclination angle of the first taper hole forming surface with respect to the axial direction of the first bearing is greater than an inclination angle of an outer surface of the first taper portion with respect to the axial direction of the rotating shaft. a rotating shaft; an impeller; a first bearing that supports the rotating shaft; and a first supply passage for supplying a lubricating liquid between the rotating shaft and the first bearing, wherein the impeller is fixed to the rotating shaft, a working fluid intake side of the impeller facing the first bearing, the rotating shaft includes a first taper portion and a first cylindrical portion, the first taper portion increasing in diameter toward the impeller in an axial direction of the rotating shaft, the first cylindrical portion being located adjacent to a large diameter end of the first taper portion, the first bearing includes a first taper support surface and a first cylindrical portion support surface, the first taper support surface including a first taper hole forming surface that forms a taper hole that extends toward a small diameter end of the first taper portion from a particular point on the first bearing in an axial direction of the first bearing, the first taper support surface rotatably supporting the first taper portion via the lubricating liquid, the first cylindrical portion support surface rotatably supporting the first cylindrical portion via the lubricating liquid, the first supply passage is open to a space formed between the first cylindrical portion and the first cylindrical portion support surface, and an inclination angle of the first taper hole forming surface with respect to the axial direction of the first bearing is greater than an inclination angle of an outer surface of the first taper portion with respect to the axial direction of the rotating shaft.