A protector effectively suppresses infections. The protector protects a tube entry part, where a tube passes through the skin of a living body, from infections, and includes a sticking part that is stuck onto the skin of the living body in a periphery of the tube entry part, and a covering that covers the tube entry part, forms an internal space that surrounds the tube entry part, and has a passage through which the tube passes. The covering is provided with an opening that can be freely opened and closed with a cap or the like.