A link mechanism for connecting a movable ring with a variable vane and rotating the variable vane around an axis (Aw) of the variable vane in connection with movement of the movable ring, the link mechanism comprising: a rotary shaft formed in a cylindrical shape around the axis (Aw) and having a distal end fixed or configured to be fixed to the variable vane and a pin pushing thread hole recessed from a proximal end of the rotary shaft to the distal end in a direction parallel to the axis (Aw); a link member having a shaft insertion hole which passes in a direction parallel to the axis (Aw) and through which the proximal end of the rotary shaft can be inserted; a detent pin configured to restrict the link member to be relatively non-rotatable around the axis (Aw) with respect to the proximal end of the rotary shaft; a pin support member to which the detent pin is fixed; and a pushing bolt having a male thread section that can be thread-engaged with the pin pushing thread hole of the rotary shaft, wherein a pin hole, which is formed from the proximal end of the rotary shaft to the link member, which is recessed toward the distal end in a direction parallel to the axis (Aw), and into which the detent pin can be fitted, is formed at the proximal end of the rotary shaft and the link member into which the proximal end is inserted, a pin removing thread hole passing in a direction in which the detent pin fixed to the pin support member extends, and concentric with the pin pushing thread hole of the rotary shaft when the detent pin is fitted into the pin hole, is formed in the pin support member, and a thread major diameter of the pin removing thread hole being larger than a thread major diameter of the male thread section of the pushing bolt, and smaller than an outer diameter of a bolt head section of the pushing bolt. a rotary shaft formed in a cylindrical shape around the axis (Aw) and having a distal end fixed or configured to be fixed to the variable vane and a pin pushing thread hole recessed from a proximal end of the rotary shaft to the distal end in a direction parallel to the axis (Aw); a link member having a shaft insertion hole which passes in a direction parallel to the axis (Aw) and through which the proximal end of the rotary shaft can be inserted; a detent pin configured to restrict the link member to be relatively non-rotatable around the axis (Aw) with respect to the proximal end of the rotary shaft; a pin support member to which the detent pin is fixed; and a pushing bolt having a male thread section that can be thread-engaged with the pin pushing thread hole of the rotary shaft, wherein a pin hole, which is formed from the proximal end of the rotary shaft to the link member, which is recessed toward the distal end in a direction parallel to the axis (Aw), and into which the detent pin can be fitted, is formed at the proximal end of the rotary shaft and the link member into which the proximal end is inserted, a pin removing thread hole passing in a direction in which the detent pin fixed to the pin support member extends, and concentric with the pin pushing thread hole of the rotary shaft when the detent pin is fitted into the pin hole, is formed in the pin support member, and a thread major diameter of the pin removing thread hole being larger than a thread major diameter of the male thread section of the pushing bolt, and smaller than an outer diameter of a bolt head section of the pushing bolt.