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AbstractThe open inflation model recently proposed by Hawking and Turok is investigated in scalar-tensor gravity context. If the dilaton-like field has no potential, the instanton of our model is singular but has a finite action. The Gibbons-Hawking surface term vanishes and hence, can not be used to make Ω0 nonzero. To obtain a successful open inflation one should introduce other matter fields or a potential for the dilaton-like fields. PACS numbers: 98.80.Cq 1 Recently, Hawking and Turok [1, 2] proposed that an open inflation can be obtained by the singular instanton describing quantum creation of a homogeneous open universe with ‘no-boundary ’ proposal. Their model does not require fine tuning of parameters to obtain the bubble formation and, at the same time, the slow-roll inflation required in earlier models. However, the HT(Hawking-Turok) instanton solution is singular and the physical nature of this singularity is still controversial [5, 6, 7]. In this paper, we will extend their works to the case with scalar-tensor gravity.