A transport line cover with excellent workability that can be operated by an operator even with one hand. Proposed is a transport line cover that includes a cover body adapted to cover an opening at a top of a sample transport apparatus, the sample transport apparatus accommodating a plurality of transport lines that extend in one direction; and a first groove formed on an upper face of the cover body, the first groove extending from one short side to another short side of the cover body. A lower end of a long-side side face of the cover body is located at a level below a bottom face of the first groove.