A variable displacement turbocharger comprising: a turbine housing into which exhaust gas from an internal combustion engine is introduced; a turbine rotor which is provided in the turbine housing and is configured to be rotated by the exhaust gas; a turbine shaft having one end inserted in the turbine housing, the turbine rotor being attached to said end; a bearing which is configured to support the turbine shaft; a bearing housing which houses the bearing and is formed with an annular recess protruding in an axial direction toward a turbine housing side from an outer peripheral part of a rear surface of the bearing housing, the rear surface extending in a radial direction; a variable nozzle mechanism which is assembled and housed in an annular recess formed inside the annular recess of the bearing housing and is configured to regulate a flow of the exhaust gas to the turbine rotor; a link mechanism which is configured to convert reciprocal displacement from an actuator that operates the variable nozzle mechanism into rotational displacement and transmit the rotational displacement to an inner section of the annular recess of the bearing housing, the link mechanism extending through the rear surface; and an engaging part which is configured to engage an output section of the link mechanism and an input section of the variable nozzle mechanism, wherein the engaging part is constituted by a pin insertion part which comprises a pin projecting from a side surface of a drive ring on an outer peripheral side of the drive ring constituting the variable nozzle mechanism, a two-fork portion (43, 55) formed at an end of an output lever constituting the link mechanism and a pin insertion slot (45, 54) formed on an inner side of the two-fork portion (43, 55) and into which the pin is inserted, wherein the pin insertion slot has a flat surface on a side face of the two-fork portion so as to guide a tip of the pin to an insertion position, characterized in that the two-fork portion (43, 55) is configured to engage with the pin such that a left tip and a right tip of the two-fork portion (43, 55) face an inner peripheral wall surface of the annular recess of the bearing housing, a corner of each of the left tip and the right tip of the two-fork portion (43, 55) being rounded (Ra) to avoid contact with the peripheral inner wall surface of the annular recess at rotation. a turbine housing into which exhaust gas from an internal combustion engine is introduced; a turbine rotor which is provided in the turbine housing and is configured to be rotated by the exhaust gas; a turbine shaft having one end inserted in the turbine housing, the turbine rotor being attached to said end; a bearing which is configured to support the turbine shaft; a bearing housing which houses the bearing and is formed with an annular recess protruding in an axial direction toward a turbine housing side from an outer peripheral part of a rear surface of the bearing housing, the rear surface extending in a radial direction; a variable nozzle mechanism which is assembled and housed in an annular recess formed inside the annular recess of the bearing housing and is configured to regulate a flow of the exhaust gas to the turbine rotor; a link mechanism which is configured to convert reciprocal displacement from an actuator that operates the variable nozzle mechanism into rotational displacement and transmit the rotational displacement to an inner section of the annular recess of the bearing housing, the link mechanism extending through the rear surface; and an engaging part which is configured to engage an output section of the link mechanism and an input section of the variable nozzle mechanism, wherein the engaging part is constituted by a pin insertion part which comprises a pin projecting from a side surface of a drive ring on an outer peripheral side of the drive ring constituting the variable nozzle mechanism, a two-fork portion (43, 55) formed at an end of an output lever constituting the link mechanism and a pin insertion slot (45, 54) formed on an inner side of the two-fork portion (43, 55) and into which the pin is inserted, a pin projecting from a side surface of a drive ring on an outer peripheral side of the drive ring constituting the variable nozzle mechanism, a two-fork portion (43, 55) formed at an end of an output lever constituting the link mechanism and a pin insertion slot (45, 54) formed on an inner side of the two-fork portion (43, 55) and into which the pin is inserted, wherein the pin insertion slot has a flat surface on a side face of the two-fork portion so as to guide a tip of the pin to an insertion position, characterized in that the two-fork portion (43, 55) is configured to engage with the pin such that a left tip and a right tip of the two-fork portion (43, 55) face an inner peripheral wall surface of the annular recess of the bearing housing, a corner of each of the left tip and the right tip of the two-fork portion (43, 55) being rounded (Ra) to avoid contact with the peripheral inner wall surface of the annular recess at rotation.