The differential spectrum of TeV gamma rays between 1.5 TeV and 20 TeV from the north-east rim of SN1006 was obtained from the data observed in 1996 and 1997 using the 3.8m CANGAROO v{C}erenkov telescope. This spectrum matches the model calculated using the Inverse Compton (IC) process with 2.7k Cosmic Microwave Background (CMB). This enables us to estimate the absolute strength of the magnetic field around the shock and the maximum energy of accelerated electrons with the considerable accuracy: the obtained field strength and maximum electron energy are $4pm1$ $mu$G and 50 TeV respectively. Also we have detected again the TeV gamma-ray emission from the same position using the 10m CANGAROO-II telescope in 2000, and the preliminary spectrum around 1 TeV region is presented in this conference. The two spectra agree well in the overlapped energy region.
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