A variable displacement exhaust turbocharger which is equipped with a variable nozzle mechanism and is driven by exhaust gas from an engine, the variable displacement exhaust turbocharger comprising: a plurality of nozzle vanes supported rotatably by a nozzle mount which is fixed to a case including a turbine casing of the variable displacement exhaust turbocharger; a drive ring which is interlocked with an actuator and is fitted to an annular guide part (5a, 51a, 53a) protruding from a center part of the nozzle mount in an axial direction; a plurality of lever plates each of which is fitted to a groove formed in the drive ring at one end via a connection pin and is connected to the nozzle vane at the other end; the variable nozzle mechanism configured to swing the plurality of lever plates by rotation of the drive ring so as to change a vane angle of the plurality of nozzle vanes; and a press-fitting pin (7, 9, 20, 21, 22, 23) being press-fit to a press-fitting hole (5b, 51b), the press-fitting hole (5b, 51b) being formed in the annular guide part (5a, 51a, 53a) along a rotation axis of the nozzle mount at a position slightly closer to a rotation axis than the annular guide part (5a, 51a, 53a), characterised in that a bulge suppressing portion (5e, 21e, 22e, 24e) is provided in at least one of the press-fitting pin (7, 9, 20, 21, 22, 23) or the press-fitting hole (5b, 51b), the bulge suppressing portion including a space formed in a section corresponding to the thickness of the drive ring in the direction of the rotation axis so as to absorb and suppress a bulge of an outer peripheral surface of the annular guide part (5a, 51a, 53a) generated when the press-fitting pin (7, 9, 20, 21, 22, 23) is press-fit in the press-fitting hole (5b, 51b). a plurality of nozzle vanes supported rotatably by a nozzle mount which is fixed to a case including a turbine casing of the variable displacement exhaust turbocharger; a drive ring which is interlocked with an actuator and is fitted to an annular guide part (5a, 51a, 53a) protruding from a center part of the nozzle mount in an axial direction; a plurality of lever plates each of which is fitted to a groove formed in the drive ring at one end via a connection pin and is connected to the nozzle vane at the other end; the variable nozzle mechanism configured to swing the plurality of lever plates by rotation of the drive ring so as to change a vane angle of the plurality of nozzle vanes; and a press-fitting pin (7, 9, 20, 21, 22, 23) being press-fit to a press-fitting hole (5b, 51b), the press-fitting hole (5b, 51b) being formed in the annular guide part (5a, 51a, 53a) along a rotation axis of the nozzle mount at a position slightly closer to a rotation axis than the annular guide part (5a, 51a, 53a), characterised in that a bulge suppressing portion (5e, 21e, 22e, 24e) is provided in at least one of the press-fitting pin (7, 9, 20, 21, 22, 23) or the press-fitting hole (5b, 51b), the bulge suppressing portion including a space formed in a section corresponding to the thickness of the drive ring in the direction of the rotation axis so as to absorb and suppress a bulge of an outer peripheral surface of the annular guide part (5a, 51a, 53a) generated when the press-fitting pin (7, 9, 20, 21, 22, 23) is press-fit in the press-fitting hole (5b, 51b).