Catalyst for oxidation or ammoxidation, and process for producing the same

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It is an object to provide a oxide catalyst for producing an unsaturated acid or unsaturated nitrile by which reaction results are good and a high yield can be stably maintained for a prolonged period of time, a process for producing the oxide catalyst, and a process for producing an unsaturated acid or unsaturated nitrile using the oxide catalyst. According to the present invention, there is provided an oxide catalyst represented by following compositional formula (1) :          Mo1VaSbbNbcMndWeYfOn     (1) wherein Y represents at least one element selected from alkaline earth metals and rare earth metals; a, b, c, d, e, f, and n each represents an atomic ratio based on one atom of Mo; 0.1 ≤ a ≤ 1, 0.01 ≤ b ≤ 1, 0.01 ≤ c ≤ 1, 0 < d < 0.08, 0 < e <0.08, 0 < (d+e) ≤ 0.08, 0 ≤ f ≤ 1; and n is a number determined by valencies of the constituent metals.