The superconducting gap structure, especially the direction of the nodes, is an unresolved issue in most of unconventional superconductors. Recently it has been demonstrated that the thermal conductivity \kappa is a powerful tool for probing the nodal structure. Here measuring \kappa in H rotating within the basal plane, we discuss the nodal structure of the unconventional superconductors, spin-triplet Sr₂RuO₄, heavy fermion CeCoIn₅, organic \kappa -(BEDT-TTF)₂Cu(NCS)₂, and borocarbide YNi₂B₂C.

PACS numbers: 74.20.Rp, 74.25.Fy, 74.25.Jb, 74.70.Dd