This study aims at generating new interview methods for obtaining more detailed information regarding human emotional factors by utilizing sensing technology. It can improve the weaknesses of qualitative research past discussions have pointed out, and develop the validity of collected data and more objective analysis of collected data in qualitative research. As the first step for a new research method, the study uses two types of sensing device which assess the emotional condition of an interviewee. The first device is ST technology, voice analysis software and a system of emotion estimation. This device using voice analysis defines what emotional condition the interviewees have. When the interviewee makes a statement, the ST technology can investigate his‑her emotional condition, such as whether the interviewee stated it disappointedly, delightly, or angrily, while the conventional coding simply relies on text data. The second device is WHS‑1, portable sensing device. This device investigates whether the interviewee stated certain things in a relaxed or stressed condition by measuring heart rate and analysing the condition of autonomic nerves. The study finally adopts both devices to precisely assess the interviewee’s emotional condition, and demonstrates that the two devices enable the researcher to obtain closer view of the interviewees. The study suggests that generally the two types of sensing device can play a supportive role in analysing emotional factors for interview research. While the researcher can only ascertain stressful or delightful factors based on coding analysis, using sensing devices enables the researcher to identify how stressful or joyful the interviewee is, and why they are in this state, ie. are they stressed due to anger or sorrow? It is expected to enable the researcher to more deeply consider the reason the interviewee is in a certain emotional condition, and also lead to contextual or theoretical discussion.