Abstract: An improved structure of trashcan includes a main body, a bearing seat, and a slipped-on cap. The main body being a container with chopped-head-cone in shape furnishes a plurality of recess portions at equal spaces at the bottom edge thereof and a fastening part inside and at the bottom thereof. The fastening part further includes an opening, a first flange, a second flange, and a sliding track. A neck part being formed at the top open end of the container has a plurality of perforations. The bearing seat, being a member capable of slipping in a roll of trash bag further includes a first wrapping part, a second wrapping part, a slot part, a first supporting end, and a second supporting end. The slipped-on cap being a wrapping member is capable of slipping on the neck part.