To effectively remove dust in fuel headed for a fuel supply passage from a fuel tank and to reduce frequency of maintenance of a filter.

A filter storage chamber 1 of volume smaller than volume of the fuel tank T facing a bottom part Tb of the fuel tank T is arranged, and an upper part of the filter storage chamber 1 and a bottom part Tb of the fuel tank T are connected by a fuel inflow passage 3. The filter F arranged in the filter storage chamber is arranged at an upper position in a gravity direction than a bottom part 1e of the filter storage chamber 1 out of a projection surface A of an opening of the fuel inflow passage 3.