To provide a supercharging pressure variable turbocharger inhibiting deposition of foreign matter in clearances between rotary shafts of nozzle vanes and inner peripheral walls of support holes supporting the rotary shafts and satisfactorily maintaining a supercharging pressure varying function of the turbocharger for a long time.

A gas passage 15 is formed along an inner periphery of a scroll passage in a turbine housing of the supercharging pressure variable turbocharger. There are arranged in the turbine housing the plurality of nozzle vanes 20 for adjusting a passage cross-sectional area of the gas passage 15 and a nozzle ring 16 having the support holes 17 rotatably supporting the rotary shafts 19 of the respective nozzle vanes 20. Grooves 21, 22 extending in different directions are formed two by two respectively in outer peripheral walls 19a of the rotary shafts 19.