A turbine rotor blade row, comprising: a plurality of turbine rotor blades disposed along a circumferential direction of a hub with an inter-blade flow channel formed between the turbine rotor blades, wherein the inter-blade flow channel has an inlet and an outlet, a first cross-sectional shape perpendicular to a radial direction of the hub at a first position in the radial direction, and a second cross-sectional shape perpendicular to the radial direction of the hub at a second position farther from the hub than the first position in the radial direction, wherein the first cross-sectional shape has a throat portion between the inlet and the outlet of the inter-blade flow channel in an axial direction of the hub, and wherein an expression A1/B1>A2/B2 is satisfied, where A1 is a flow-channel width of the first cross-sectional shape at the outlet of the inter-blade flow channel, B1 is a flow-channel width of the first cross-sectional shape at the throat portion, A2 is a flow-channel width of the second cross-sectional shape at the outlet of the inter-blade flow channel, and B2 is a flow-channel width of the second cross-sectional shape at the same position as the throat portion of the first cross-sectional shape in the axial direction of the hub, wherein the second cross-sectional shape includes a throat portion between the inlet and the outlet of the inter-blade flow channel; characterized in that the throat portion of the second cross-sectional shape is disposed closer to the outlet of the inter-blade flow channel in the axial direction of the hub than the throat portion of the first cross-sectional shape is. a plurality of turbine rotor blades disposed along a circumferential direction of a hub with an inter-blade flow channel formed between the turbine rotor blades, wherein the inter-blade flow channel has an inlet and an outlet, a first cross-sectional shape perpendicular to a radial direction of the hub at a first position in the radial direction, and a second cross-sectional shape perpendicular to the radial direction of the hub at a second position farther from the hub than the first position in the radial direction, wherein the first cross-sectional shape has a throat portion between the inlet and the outlet of the inter-blade flow channel in an axial direction of the hub, and wherein an expression A1/B1>A2/B2 is satisfied, where A1 is a flow-channel width of the first cross-sectional shape at the outlet of the inter-blade flow channel, B1 is a flow-channel width of the first cross-sectional shape at the throat portion, A2 is a flow-channel width of the second cross-sectional shape at the outlet of the inter-blade flow channel, and B2 is a flow-channel width of the second cross-sectional shape at the same position as the throat portion of the first cross-sectional shape in the axial direction of the hub, wherein the second cross-sectional shape includes a throat portion between the inlet and the outlet of the inter-blade flow channel; characterized in that the throat portion of the second cross-sectional shape is disposed closer to the outlet of the inter-blade flow channel in the axial direction of the hub than the throat portion of the first cross-sectional shape is.