In-tank fuel filter

A fuel filtration device (2) includes a filter medium (11, 12) in which at least two opposing surfaces are formed, an inner portion space (14) that is surrounded by the filter medium (11, 12) and where liquid accumulates, and a connecting member (13) that connects the inner portion space (14) and outside of the inner portion space (14) and delivers the liquid in the inner portion space (14) to the outside of the inner portion (14). The filter medium (11, 12) is a non-woven fabric made of material fibers (31) and adhesive fibers (32), and by melting the adhesive fibers (32), the material fibers (31) are joined.