A filter device is capable of reliably capturing emboli and air bubbles and reliably removing the captured emboli out of the body. The filter device includes: a first tube； a second tube protruding from the first tube； a filter arranged such that the distal end side of the filter in the longitudinal direction forms an opening； a ring fixed to the opening； first wires protruding from the distal end side of the first tube in the longitudinal direction thereof； and second wires protruding from holes in the first tube and fixed to the ring； wherein the opening can be opened and closed in the form of a bag when the proximal end side of the filter in the longitudinal direction is defined as the bottom, and the opening can be closed by pulling the second tube towards the proximal end side in the longitudinal direction.
