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We have observed the prompt emission of GRB100418A, from its beginning by theMAXI/SSC (0.7-7 keV) on board the International Space Station followed by theSwift/XRT (0.3-10 keV) observation. The light curve can be fitted by acombination of a power law component and an exponential component (decayconstant is $31.6\pm 1.6$ sec). The X-ray spectrum is well expressed by theBand function with $E_{\rm p}\leq$8.3 keV. This is the brightest GRB showing avery low value of $E_{\rm p}$. It satisfies the Yonetoku-relation ($E_{\rmp}$-$L_{\rm p}$). It is also consistent with the Amati relation ($E_{\rmp}$-$E_{\rm iso}$) in 2.5$\sigma$ level.

Soft X-ray Observation of the Prompt Emission of GRB100418A