Provided is a turbine, including: a housing having a discharge port; a turbine rotor, which is arranged in the housing, and includes: a hub provided on a shaft; blades provided on an outer periphery of the hub; and an inclined portion, which is formed at an outer peripheral end of each of the blades, and is inclined toward a leading side in a rotation direction as approaching the discharge port side; a turbine scroll flow passage formed in the housing; and a tongue portion including: a distal end portion protruding into the turbine scroll flow passage; and a tapered surface, which is formed in the distal end portion, and is inclined toward the leading side in the rotation direction of the shaft as approaching the discharge port side.