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Motivated by the PAMELA anomaly in the fluxes of cosmic-ray electron andpositron, we study the cosmic gamma-ray induced by the inverse Compton (IC)scattering process in unstable dark matter scenario assuming that the anomalyis due to the electron and positron emission by the decay of dark matter. Wecalculate the fluxes of IC-induced gamma-ray produced in our Galaxy and thatfrom cosmological distance, and show that both of them are significant. If thegamma-ray flux is precisely determined by Fermi Gamma-ray Space Telescope forvarious line-of-sight directions, it will provide an important test of thedecaying dark matter scenario.

Cosmic Gamma-ray from Inverse Compton Process in Unstable Dark Matter Scenario