Measurements of the magnetic susceptibilities χ of liquid 3d transition metal--Sb alloys were carried out systematically to determine the composition of transition metals where the magnetic-to-nonmagnetic transition occurs. Liquid Ni1-cSbc with c ≤ 0.11, liquid Co1-cSbc with c ≤ 0.50, liquid Fe1-cSbc with c ≤ 0.90, liquid Mn1-cSbc with 0.20 ≤ c ≤ 0.91, and liquid Cr1-cSbc with 0.42 ≤ c ≤ 0.90 exhibited the Curie--Weiss behavior with a reasonable effective number of Bohr magnetons. The magnetic susceptibilities of other liquid TM--Sb alloys were found to be almost independent of temperature, which suggests that TM ions in their TM--Sb alloys are in the nonmagnetic state. On the Sb-rich side, χ in the nonmagnetic state was studied using the Anderson model. The composition dependence of χ for liquid Ni--Sb and Fe--Sb increases gradually with increasing Ni and Fe compositions, respectively. Particularly, χ for liquid Co--Sb increases rapidly on the Co-rich side. This suggests that there is a strong interatomic exchange interaction between parallel spins of Co ions. The composition dependences of χ for liquid Mn--Sb and Cr--Sb alloys show maxima at compositions of 70 at. % Mn and 50 at. % Cr, respectively.