This study focuses on the effect of very short breaks, called micro refresh (MR), which are taken separately from regular breaks during intellectual work. In this study, we investigate a method to promote MR by changing the visual background while working in a VR space. It is assumed that detaching the attention from the work content by changing the environment through VR would be effective for refreshment. We created a VR system to promote MR and conducted an experiment on 12 subjects. As a result of the experiment, six participants had a high CTR (Concentration Time Ratio) under the condition with background change, and other six participants had a low CTR. From the subjective questionnaire, it was found that the system did not adequately promote detachment and refreshment. This may have been due to weak visual background change and the physical burden of the HMD.