  We incorporate closed string field into Kaku's open string field theory which
is defined by using Kaku vertex, and we construct open-closed string field
theory. To do this, we define new consistent open-closed vertex and
open-open-closed vertex with the Kaku vertex. Because these vertices depend on
Chan-Paton parameter such as the Kaku vertex, the open-closed string field
theory action that we construct depends on the Chan-Paton parameter such as the
Kaku's theory action. However, we can show that an infinitesimal change of $l$
corresponds to a field redefinition. Furthermore, we compute closed string
amplitudes around tachyon vacuum solution in this theory. As a result, we
confirm that these are conventional pure closed string amplitudes on surfaces
without boundaries.
