A turbo machine comprising: a cylindrical bearing housing; a rotation shaft that is located in the bearing housing and includes a straight portion having a constant outer diameter; a bearing that is a plain bearing, that includes a non-tapered hole having a constant inner diameter and constituting a portion of the inner surface of the bearing that faces the straight portion of the rotation shaft, that is disposed between an inner surface of the bearing housing and an outer surface of the rotation shaft, that rotatably supports the rotation shaft at least in a radial direction of the rotation shaft, and that has one end in an axial direction of the bearing, the one end being located in the bearing housing; a bearing holder that is fixed to one end of the bearing housing in the axial direction of the bearing and that faces the one end of the bearing; and an end elastic body that is disposed between the one end of the bearing and the bearing holder in the axial direction of the bearing, that is in contact with the bearing and the bearing holder, and that is formed of a material having a lower modulus of elasticity than a material forming the bearing holder, wherein the rotation shaft includes a tapered portion having an outer diameter decreasing gradually toward an end of the rotation shaft, and the bearing includes a tapered hole having an inner diameter decreasing gradually toward the end of the rotation shaft and constituting a portion of the inner surface of the bearing that faces the tapered portion of the rotation shaft, and the bearing supports a load in the axial direction of the rotation shaft and the load in the radial direction of the rotation shaft. a cylindrical bearing housing; a rotation shaft that is located in the bearing housing and includes a straight portion having a constant outer diameter; a bearing that is a plain bearing, that includes a non-tapered hole having a constant inner diameter and constituting a portion of the inner surface of the bearing that faces the straight portion of the rotation shaft, that is disposed between an inner surface of the bearing housing and an outer surface of the rotation shaft, that rotatably supports the rotation shaft at least in a radial direction of the rotation shaft, and that has one end in an axial direction of the bearing, the one end being located in the bearing housing; a bearing holder that is fixed to one end of the bearing housing in the axial direction of the bearing and that faces the one end of the bearing; and an end elastic body that is disposed between the one end of the bearing and the bearing holder in the axial direction of the bearing, that is in contact with the bearing and the bearing holder, and that is formed of a material having a lower modulus of elasticity than a material forming the bearing holder, wherein the rotation shaft includes a tapered portion having an outer diameter decreasing gradually toward an end of the rotation shaft, and the bearing includes a tapered hole having an inner diameter decreasing gradually toward the end of the rotation shaft and constituting a portion of the inner surface of the bearing that faces the tapered portion of the rotation shaft, and the bearing supports a load in the axial direction of the rotation shaft and the load in the radial direction of the rotation shaft.