Phosphor and light emitting device using the same

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There is provided a phosphor emitting light of high brightness and having high weatherability, which has a composition represented by the following general formula : €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ (M 1 1-y R y ) a MgM 2 b M 3 c O a+2b+(3/2)c X 2 wherein M 1 is at least one element selected from the group consisting of Ca, Sr, Ba, Zn and Mn, M 2 is at least one element selected from the group consisting of Si, Ge and Sn, M 3 is at least one element selected from the group consisting of B, Al, Ga and In, X is at least one element selected from the group consisting of F, Cl, Br and I, R is at least one element selected from the group consisting of rare earth elements with Eu being an inevitable element, and y, a, b and c satisfy the following relationships of 0.0001 ‰ y ‰ 0.3, 7.0 ‰ a < 10.0, 3.0 ‰ b < 5.0 and 0 ‰ c < 1.0.