PURPOSE: To provide a temp. measuring method having high capacity, by correcting the difference of a measuring error based on the temp. characteristics of a temp. measuring body itself and a measuring error mixed by such a reason that the temp. condition of a circumferential environment is changed before the surface temp. information measured by the temp. measuring body is subjected to temp. display.

CONSTITUTION: When temp. measurement is performed by using a temp. measuring body A belonged to a classification section 1, variable resistance 7 is controlled so as to generate a pulse line with frequency alloted with respect to said classification section 1 from a non-stable multi-vibrator circuit 5. When the temp. measurement of an object to be subjected to temp. measurement is actually performed by using a temp. measuring body A as a temp. measuring body 4, the temp. measureing body 4 is provided in the object to be subjected to temp. measurement to always generate an electric resistance value changed in correspondense with temp. change as surface temp. electric information. The detected electric information is sent to a first correction coperator circuit 15 by a pulse detector 13 and compared with the alotted electric information with frequency of preliminarily stored in a memory circuit 18 to perform the operations of a temp. error Δf1 and an error ratio Δf1/f0. In addition, the electric information is sent to a temp. converter circuit 17 from a second correction operator circuit 16.