To always stably keep a space between a lower face constitution part and an upper face constitution part constituting a bag-shaped body above a certain distance in a filter apparatus having the bag-shaped body made of a filtering material attached to a fuel sucking part.

This filter apparatus has the bag-shaped body 1 made of the filtering material 10 making the inside of the bag communicate with the sucking part Tb, and crashing-preventive parts 2 of the bag-shaped body 1 fixed respectively to a lower face constitution part 13 and an upper face constitution part 14 of the bag-shaped body 1 and projecting into the inside of the body 1. The crashing-preventive parts 2 of the lower face constitution part 13 and upper face constitution part 14 of the bag-shaped body 1 are formed to butt to each other with a protrusion 21 provided on one of the parts 2 fit in a recessed part 20 provided in the other part 2.