NOVELTY - A thermoelectric material comprises a composition of metal alloy complex (I) containing titanium, hafnium, zirconium, cobalt and antimony.    USE - As a thermoelectric alloy material for thermoelectric conversion module useful in thermoelectric power generating device for producing electric power (claimed).    ADVANTAGE - The thermoelectric material provides high thermoelectric conversion efficiency; has reduced contents of antimony (which is harmful) which is replaced by harmless tin.    DETAILED DESCRIPTION - A thermoelectric material comprises a composition of metal alloy complex of formula (TipHfqZr1-p-q)xCoy(Sb1-r)100-x-y (I). The thermoelectric material includes a phase having an MgAgAs crystal structure as a main phase.    p=value of greater than 0.1 and less than or equal to 50.3;    q=value of greater than 0.1 and less than or equal to 0.3;    r=value of greater than 0.1 and less than or equal to 0.8;    x and y=30-35 atomic %.    INDEPENDENT CLAIMS are included for the following:    (1) a thermoelectric conversion module (M1) comprising: a first electrode; a p-type thermoelectric element with one end connected to the first electrode; a second electrode connected to the other end of the p-type thermoelectric element; an n-type thermoelectric element with one end connected to the second electrode; and a third electrode connected to the other end of the n-type thermoelectric element, where at least one of the p-type and n-type thermoelectric elements is composed of a thermoelectric material comprising a composition expressed by a complex of formula (TizHfqZr1-p-q)xCoy(Sb1-rSnr)100-x-y (II), and the thermoelectric material includes a phase having an MgAgAs crystal structure as a main phase; and    (2) a thermoelectric power generating device (21) comprising: a high-temperature portion (22); a low-temperature portion (23); and the thermoelectric conversion module (M1) (10) and disposed between the high-temperature portion and the low-temperature portion, where heat of the high-temperature portion is converted into electric power by the thermoelectric conversion module (M1).    z=value greater than 0.1 and less than or equal to 0.3.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of a thermoelectric power generating device.    Thermoelectric conversion module (10)    A high-temperature portion (22)    A low-temperature portion. (23)