Provided is a catheter including a hollow shaft, a mesh member having a tubular shape joined to a distal end side of the hollow shaft and capable of radially expanding and contracting, an expanding and contracting functional portion for radially expanding and contracting the mesh member, a distal-end fixed member joined to a distal end side of the mesh member, and a connector joined to a proximal end side of the hollow shaft. The connector is configured to attach to an aspirator, the aspirator being for applying negative pressure in the inside of the hollow shaft.
