The present invention realizes a thermoelectric conversion material having excellent thermoelectric performance over a wide temperature range, and a thermoelectric conversion module providing excellent junctions between thermoelectric conversion materials and electrodes.The present invention provides an R-T-M-X-N thermoelectric conversion material that has a structure expressed by the following formula: RrTt−mMmXx−nNn (0<r≦1, 3≦t−m≦5, 0≦m≦0.5, 10≦x≦15, 0≦n≦2),where R represents three or more elements selected from the group consisting of rare earth elements, alkali metal elements, alkaline-earth metal elements, group 4 elements, and group 13 elements,T represents at least one element selected from Fe and Co,M represents at least one element selected from the group consisting of Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au,X represents at least one element selected from the group consisting of P, As, Sb, and Bi, andN represents at least one element selected from Se and Te.