The present disclosure pertains to a fixing tool for holding a tubular catheter fixed in relation to the skin of a patient. This catheter fixing tool is equipped with a plate-shaped fixing tool main body and a securing member. The fixing tool main body has a retaining part, defining a catheter retaining slot, and a pair of wing pieces. The securing member can be interlocked with the fixing tool main body by rotating the securing member in a direction parallel to a principal surface of the fixing tool main body taking a virtual line perpendicular to the principal surface as the central axis C1. When securing member is rotationally interlocked with the fixing tool main body, the securing member presses the retaining part and the catheter securing slot is constricted. As a result, the catheter is held fixed by the securing member.
