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Abstract We construct the integrated vertex operator for the first massive states of open superstrings with (mass)2 = 1/α ′ in the pure spinor formalism of the superstring theory. This vertex operator is expressed in terms of the ten dimensional N = 1 $$ \mathcal{N}=1 $$ superfields describing the massive supermultiplet which appear in the unintegrated vertex operator of the same states.