A medical device for collecting a solid object together with a fluid in a living body, including: a cylindrical member having an inner cavity, a suction port provided on the distal end of the inner cavity, and a discharge port on a side wall and communicating with the inner cavity； an impeller in the inner cavity configured to carry the fluid from the suction port to the discharge port； and a filter in the inner cavity configured to collect the solid object. At least part of the wall surface of the cylindrical member, which defines a flow channel allowing movement of the fluid from the impeller to the discharge port, is inclined from a center axis of the cylindrical member toward a distal end with respect to a transverse direction of the cylindrical member.
