A sample collecting device for collecting samples of cellular material includes an outer tubular member, an inner tubular member and a swab having a tip. At least one guiding element supports and slidably arranges the swab in the inner tubular member such that there is a free space around the swabbing tip. A flexible valve is arranged at a distal end of the outer tubular member. In a storage configuration, the valve is closed and seals the distal end of the outer tubular member. In a sampling configuration, the valve is open such that the swab is slidable to extend through the distal end of the outer tubular member without contacting the valve. A swab kit for collecting and storing samples of cellular material from body cavities includes a sample collecting device and a sealable container adapted to receive and store at least a part of the sample collecting device.