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We incorporate closed string field into Kaku's open string field theory whichis defined by using Kaku vertex, and we construct open-closed string fieldtheory. To do this, we define new consistent open-closed vertex andopen-open-closed vertex with the Kaku vertex. Because these vertices depend onChan-Paton parameter such as the Kaku vertex, the open-closed string fieldtheory action that we construct depends on the Chan-Paton parameter such as theKaku's theory action. However, we can show that an infinitesimal change of $l$corresponds to a field redefinition. Furthermore, we compute closed stringamplitudes around tachyon vacuum solution in this theory. As a result, weconfirm that these are conventional pure closed string amplitudes on surfaceswithout boundaries.

Closed string amplitudes around tachyon vacuum solution in Kaku theory