Abstract: A cell culture device allows co-cultivation on both sides of a membrane and has an outer tubular body with upper end having an opening and lower end closed by the membrane, an inner surface and an outer surface, which can be colonized with biological material, a complementary tubular body whose inner diameter fits onto the outer diameter of the lower end and a hanger component with upper end and a lower end. A flange extends from the upper end and the outer diameter component fits the inner diameter of the outer tubular body. The outer tubular body in a first step is connected to the complementary tubular body to form a standing insert for a first cell cultivation, and in a second step wherein the outer tubular body is disengaged from the complementary tubular body and is attached to the hanger component for a second cell cultivation.