Provided are a medical device and a treatment method that can effectively remove an object in a body lumen.This medical device (10) for removing an intravascular thrombus (T) includes: a rotatable tubular driving shaft (20) in which a spiral-shaped carrier (22) is provided on an inner surface thereof； a cutting part (40) that is provided on a distal side of the driving shaft (20) and cuts the thrombus (T)； and an elongated resistive body (50) that is disposed in a lumen of the driving shaft (20) and can be rotated relative to the driving shaft (20).
