Abstract: Disclosed is an adapter for branching a hose, in which a plurality of manifolds are connected to a flexible hose to diverge fluid passing though the hose to various direction. The present invention provides adapters of a first aspect related to a head of the adapter for branching a hose and its modifications, in which the head is inserted into one of holes formed at the hose, and a second aspect related to an inserting unit of the head of the adapter for branching a hose and its modifications such that the head can be easily inserted to one of the holes of the hose. The adapter includes a body shaped as a pipe, a head and a coupling unit. The body includes a passage therein, an inlet inserted into the hose, and an outlet connected to the manifold, which is pro-truded from the hose when the adapter is installed to the hose. The head formed at the inlet side of the body is insertedly connected to the hole of the hose. The coupling unit is formed at the outer surface of the body.