The invention provides a thermoelectric conversion module, which can implement a high power generation capacity and high reliability of electric connection between thermoelectric conversion elements and meet various diameters and lengths of a tube as a heat source. The thermoelectric conversion module includes a straight-chain module unit. In the module unit, plural P-type elements and plural N-type elements, which are alternately arrayed, are electrically connected in series by a braided wire A and a braided wire B. The braided wire A connects one end surface of the P-type element and one end surface of the N-type element. The braided wire B connects the other end surface of the P-type element and the other end surface of the N-type element. The braided wire B is shorter than the braided wire A. The thermoelectric conversion module including only the module unit is spirally wound around a tube as a heat source.