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In order to investigate the mechanical behaviours of heated rocks, Uniaxial compression tests are carried out on 4 kinds of typical rock types as AKIYOSHI marble, INADA granite, OGINO tuff and EMOCHI welded tuff under room temperature (20℃), 150℃, 450℃ and 600℃. From these tests, the following results are obtained. The mechanical behaviours of heated rocks are very different with each rock type. On AKIYOSHI marble and INADA granite, compressive strength and secant Youngs modulus take larger values as temperature rises. The former rock indicates ductility over 300℃, and the latter rock yields at 600℃ by only temperature before the axial load is applied. On OGINO tuff, the values of compressive strength and secant Young's modulus are slightly smaller to 300℃ as temperature goes up, and these values are larger over 300℃. On EMOCHI welded tuff, these values are larger with rising temperature. Also, the value of strain at failure point becomes larger as temperature is higher, except EMOCHI welded tuff.