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 expanding and contracting in radial directions, an expanding and contracting functional portion for expanding and contracting the mesh member, a distal-end fixed member joined to a distal end side of the mesh member, and an aspirator-attachment portion for attachment of an aspirator, the aspirator being for applying negative pressure in the inside of the hollow shaft, the aspirator-attachment portion being provided at a proximal end side of the hollow shaft.
